| **Debt (Details) (USD $)**                                          | 12 Months Ended                                                                                  |
|---------------------------------------------------------------------|--------------------------------------------------------------------------------------------------|
||
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | $ 78,832,000,000                                                                                 | $ 73,234,000,000 |
| Weighted average contractual interest rate                          | 1.43%                                                                                            | 1.70% |
| Increase (decrease) in carrying value adjustment on debt            | (257,000,000)                                                                                    |   |
| Debt maturity dates                                                 | As of March 31, 2013, our notes and loans payable mature on various dates through fiscal 2047.   |   |
| Commercial paper [Member]                                           |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | 24,590,000,000                                                                                   | 21,247,000,000 |
| Weighted average contractual interest rate                          | 0.24%                                                                                            | 0.38% |
| Commercial paper average remaining maturity                         | As of March 31, 2013, our commercial paper had a weighted average remaining maturity of 84 days. |   |
| Unsecured notes and loans payable [Member]                          |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | 46,707,000,000                                                                                   | 41,415,000,000 |
| Weighted average contractual interest rate                          | 2.19%                                                                                            | 2.63% |
| Debt denominated in foreign currency                                | 13,200,000,000                                                                                   | 15,800,000,000 |
| Unsecured notes and loans payable [Member] | Floating rate [Member] |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | 16,800,000,000                                                                                   | 16,700,000,000 |
| Contractual interest rate, minimum                                  | 0.00%                                                                                            | 0.00% |
| Contractual interest rate, maximum                                  | 6.00%                                                                                            | 6.00% |
| Unsecured notes and loans payable [Member] | Fixed rate [Member]    |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | 30,400,000,000                                                                                   | 25,500,000,000 |
| Contractual interest rate, minimum                                  | 0.50%                                                                                            | 0.50% |
| Contractual interest rate, maximum                                  | 9.40%                                                                                            | 9.40% |
| Secured notes and loans payable [Member]                            |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | 7,009,000,000                                                                                    | 9,789,000,000 |
| Weighted average contractual interest rate                          | 0.60%                                                                                            | 0.67% |
| Secured notes and loans payable [Member] | Floating rate [Member]   |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Contractual interest rate, minimum                                  | 0.40%                                                                                            | 0.50% |
| Contractual interest rate, maximum                                  | 1.90%                                                                                            | 1.90% |
| Secured notes and loans payable [Member] | Fixed rate [Member]      |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Contractual interest rate, minimum                                  | 0.40%                                                                                            | 0.50% |
| Contractual interest rate, maximum                                  | 1.90%                                                                                            | 1.90% |
| Carrying value adjustment [Member]                                  |                                                                                             |   |
| **Debt Instrument [Line Items]**                                    |                                                                                             |   |
| Debt                                                                | $ 526,000,000                                                                                    | $ 783,000,000 |

| X                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Portion of a debt instrument that is denominated in foreign currency.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase decrease in the carrying value adjustment on debt for the period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the aggregate of total long-term debt, including current maturities and short-term debt.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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