| **Fair Value Measurements Fair Value (Details) (USD $)In Millions**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 9 Months Ended |     |     |     |     |       |       |       |       |      |      |    |    |    |    |    |    |     |     |     |     |     |     |    |    |    |    |    |    |     |     |     |     |     |     |    |    |    |    |       |       |       |       |      |      |    |    |    |    |    |    |    |     | 3 Months Ended |     |      |    |
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| **Assets**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Available-for-sale securities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Â              | Â   | Â   | Â   | Â   | $ 329 | $ 159 | $ 271 | $ 407 | $ 20 | $ 20 | Â  | Â  | Â  | Â  | Â  | Â  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | Â  | Â  | Â  | Â  | Â  | Â  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | Â  | Â  | Â  | Â  | $ 329 | $ 159 | $ 271 | $ 407 | $ 20 | $ 20 | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| **Derivative financial instruments:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Asset derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | 0  | 0  | 0  | 0  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | 1  | 0  | 0  | 8  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | 3  | 2  | 0  | 0  | Â     | Â     | Â     | Â     | Â    | Â    | 4  | 2  | 0  | 8  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Retained interests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Â              | Â   | 53  | Â   | 0   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | 0  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | 53 | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Property and equipment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | 54   | 64 | Â | Â |
| Intangible assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | 30   | 84 | Â | Â |
| Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Â              | 624 | 649 | 620 | 586 | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | 1  | 8  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | 3  | 55 | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | 84   | Â  | Â | Â |
| **Derivative financial instruments:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Liability derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | 0  | 0  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | 1  | 4  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | 1  | 0  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | 2  | 4  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 0              | 2   | 4   | Â   | 0   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | 1  | 4  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | 1  | 0  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Finance receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | 9  | 27 | 9  | [1] | 27             | [1] | Â    | Â  | 22 | 50 |
| Specific loss reserves on impaired finance receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 13             | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | 13 | 23 | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Cash equivalents, restricted cash equivalents, and marketable securities, maturity period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 90 days        | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | Â    | Â  | Â | Â |
| Impairment of Long-Lived Assets Held-for-use                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | 10   | Â  | Â | Â |
| Impairment of Intangible Assets (Excluding Goodwill)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Â              | Â   | Â   | Â   | Â   | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â  | Â  | Â   | Â   | Â   | Â   | Â   | Â   | Â  | Â  | Â  | Â  | Â     | Â     | Â     | Â     | Â    | Â    | Â  | Â  | Â  | Â  | Â  | Â  | Â  |     | Â              |     | $ 54 | Â  | Â | Â |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [1]Certain impaired finance receivables are measured at fair value on a nonrecurring basis. An impairment charge is recorded for the amount by which the carrying value of the receivables exceeds the fair value of the underlying collateral, net of remarketing costs. As of JulyÂ 31, 2011, impaired receivables with a carrying amount of $22 million had specific loss reserves of $13 million and a fair value of $9 million. As of OctoberÂ 31, 2010, impaired receivables with a carrying amount of $50 million had specific loss reserves of $23 million and a fair value of $27 million. Fair values of the underlying collateral are determined by reference to dealer vehicle value publications adjusted for certain market factors.     |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair Value Disclosure Cash Equivalents Restricted Cash Equivalents Marketable Securities Maturity Period
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| - Definition
Finance Receivables Fair Value Disclosure
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| - Definition
Intangible Assets Fair Value Disclosure
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| - Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance for credit losses related to recorded investment.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software, net of accumulated depreciation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the interests continued to be held by a transferor (retained or residual interest) after transferring financial assets to a third party.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 4, 58, 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
+ Details**Name:**us-gaap_RetainedInterestFairValueDisclosure**Namespace Prefix:**us-gaap**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |