| **Consolidated Statements of Stockholders' Equity (Deficit) (USD $)In Millions**                                                                                                                                                                                                                                                                                                                                                                                                                               | Total     | Series D ConvertibleJuniorPreference Stock | Common Stock | Additional Paid-in Capital | Comprehensive Income | Accumulated Deficit | Accumulated Other Comprehensive Loss | Common Stock Held in Treasury, at Cost | Stockholders Equity Attributable to Noncontrolling Interests |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|--------------------------------------------|--------------|----------------------------|----------------------|---------------------|--------------------------------------|----------------------------------------|--------------------------------------------------------------|
| Balance at Oct. 31, 2009                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ (1,642) |                                            | $ 4          | $ 7                        | $ 2,181              | Â                   | $ (2,072)                            |                                        | $ (1,674)                                                    | $ (149) | $ 61 |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 88        | [1]                                        | Â            | Â                          | Â                    | 62                  | 62                                   |                                        | Â                                                            | Â | 26 |
| **Other comprehensive income**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Â         |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Foreign currency translation adjustments                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 8         |                                            | Â            | Â                          | Â                    | 8                   | Â                                    |                                        | Â                                                            | Â | Â |
| US OPEB remeasurement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 309       |                                            | Â            | Â                          | Â                    | 309                 | Â                                    |                                        | Â                                                            | Â | Â |
| Other post employment benefits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 46        |                                            | Â            | Â                          | Â                    | 46                  | Â                                    |                                        | Â                                                            | Â | Â |
| Total other comprehensive income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | Â         |                                            | Â            | Â                          | Â                    | 363                 | Â                                    |                                        | 363                                                          | Â | Â |
| Total comprehensive income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Â         |                                            | Â            | Â                          | Â                    | 425                 | Â                                    |                                        | Â                                                            | Â | Â |
| Transfer from redeemable equity securities upon exercise or expiration of stock                                                                                                                                                                                                                                                                                                                                                                                                                                | 3         |                                            | Â            | Â                          | 3                    | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Stock-based compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 12        |                                            | Â            | Â                          | 12                   | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Stock ownership programs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 13        |                                            | Â            | Â                          | (1)                  | Â                   | Â                                    |                                        | Â                                                            | 14 | Â |
| Cash dividends paid to non-controlling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                | (33)      |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | (33) |
| Investment from non-controlling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 2         |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | 2 |
| Balance at Apr. 30, 2010                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (1,194)   |                                            | 4            | 7                          | 2,195                | Â                   | (2,010)                              | [1]                                    | (1,311)                                                      | (135) | 56 |
| Balance at Oct. 31, 2010                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (932)     |                                            | 4            | 7                          | 2,206                | Â                   | (1,878)                              |                                        | (1,196)                                                      | (124) | 49 |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 94        |                                            | Â            | Â                          | Â                    | 68                  | 68                                   |                                        | Â                                                            | Â | 26 |
| **Other comprehensive income**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Â         |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Foreign currency translation adjustments                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 61        |                                            | Â            | Â                          | Â                    | 61                  | Â                                    |                                        | Â                                                            | Â | Â |
| Other post employment benefits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 79        |                                            | Â            | Â                          | Â                    | 79                  | Â                                    |                                        | Â                                                            | Â | Â |
| Total other comprehensive income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | Â         |                                            | Â            | Â                          | Â                    | 140                 | Â                                    |                                        | 140                                                          | Â | Â |
| Total comprehensive income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Â         |                                            | Â            | Â                          | Â                    | 208                 | Â                                    |                                        | Â                                                            | Â | Â |
| Transfer from redeemable equity securities upon exercise or expiration of stock                                                                                                                                                                                                                                                                                                                                                                                                                                | 3         |                                            | Â            | Â                          | 3                    | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Stock-based compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 21        |                                            | Â            | Â                          | 21                   | Â                   | Â                                    |                                        | Â                                                            |   | Â |
| Stock ownership programs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 23        |                                            | Â            | Â                          | 8                    | Â                   | Â                                    |                                        | Â                                                            | 15 | Â |
| Stock repurchase program                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (1)       |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | (1) | Â |
| Cash dividends paid to non-controlling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                | (32)      |                                            | Â            | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | (32) |
| Reclassification of convertible debt to mezzanine                                                                                                                                                                                                                                                                                                                                                                                                                                                              | (84)      |                                            | Â            | Â                          | (84)                 | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | (1)       |                                            | (1)          | Â                          | Â                    | Â                   | Â                                    |                                        | Â                                                            | Â | Â |
| Balance at Apr. 30, 2011                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ (769)   |                                            | $ 3          | $ 7                        | $ 2,154              | Â                   | $ (1,810)                            |                                        | $ (1,056)                                                    | $ (110) | $ 43 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [1]<div style="font-family:Times New Roman;font-size:10pt;"><div style="font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">Certain amounts have been revised to reflect a retrospective change in accounting principle. See Note 1, </font><font style="font-family:inherit;font-size:8pt;font-style:italic;">Summary of significant accounting policies</font><font style="font-family:inherit;font-size:8pt;">.</font></div></div> |

| X                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of subsequent adjustments to additional paid in captial for convertible financial instruments where a component of equity and a component of debt are recognized.
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| X                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Adjustment to additional paid in capital for the transfer from redeemable preferred stock that is classified as temporary equity upon exercise or expiration of options.
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| X                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net changes to accumulated comprehensive income during the period related to postemployment benefit, after tax.
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| X                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net changes to accumulated comprehensive income during the period related to remeasurement of postemployment benefits, after tax.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 39Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph bReference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A91
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix AReference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions to noncontrolling interest holders.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(2)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase in noncontrolling interest balance from issuance of additional shares to noncontrolling interest holders or the sale of all or a portion of the parent's equity interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(2)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents Other Comprehensive Income (Loss), Net of Tax, for the period.  Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3)Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 22, 23, 24, 25Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
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