| **Long-Term Debt (Details) (USD $)**             | 12 Months Ended  |                  |                  |
|--------------------------------------------------|------------------|------------------|------------------|
||
| **Debt Instrument**                              |             |             |             |
| Medium-term notes, maximum remaining maturity    | 10 years         |             |             |
| Long-term debt                                   | $ 25,077,000,000 | $ 21,631,000,000 | $ 19,362,000,000 |
| **Long-term debt outstanding maturity:**         |             |             |             |
| 2013                                             | 5,991,000,000    |             |             |
| 2014                                             | 6,559,000,000    |             |             |
| 2015                                             | 4,648,000,000    |             |             |
| 2016                                             | 2,027,000,000    |             |             |
| 2017                                             | 2,693,000,000    |             |             |
| Thereafter                                       | 3,159,000,000    |             |             |
| Total                                            | 25,077,000,000   | 21,631,000,000   | 19,362,000,000   |
| Medium-term notes                                |             |             |             |
| **Debt Instrument**                              |             |             |             |
| Long-term debt issued                            | 8,030,000,000    |             |             |
| Long-term debt issued at fixed interest rates    | 6,580,000,000    |             |             |
| Long-term debt issued at floating interest rates | 1,450,000,000    |             |             |
| Long term debt, gross                            | 23,488,000,000   | 20,058,000,000   | 17,690,000,000   |
| Unamortized discount                             | (13,000,000)     | (10,000,000)     | (9,000,000)      |
| Long-term debt                                   | 23,475,000,000   | 20,048,000,000   | 17,681,000,000   |
| Long-term debt, Avg. Rate                        | 3.20%            | 3.90%            | 4.60%            |
| **Long-term debt outstanding maturity:**         |             |             |             |
| Total                                            | 23,475,000,000   | 20,048,000,000   | 17,681,000,000   |
| Bank borrowings                                  |             |             |             |
| **Debt Instrument**                              |             |             |             |
| Long-term debt                                   | 1,602,000,000    | 1,583,000,000    | 1,603,000,000    |
| Long-term debt, Avg. Rate                        | 4.10%            | 3.70%            | 3.80%            |
| **Long-term debt outstanding maturity:**         |             |             |             |
| Total                                            | 1,602,000,000    | 1,583,000,000    | 1,603,000,000    |
| Secured borrowings                               |             |             |             |
| **Debt Instrument**                              |             |             |             |
| Long-term debt                                   | 0                | 0                | 78,000,000       |
| Long-term debt, Avg. Rate                        |             |             | 4.90%            |
| **Long-term debt outstanding maturity:**         |             |             |             |
| Total                                            | $ 0              | $ 0              | $ 78,000,000     |

| X                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Long-term debt issued during period.
+ References
No definition available.
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| - Definition
Long-term debt issued during the period which accrues interest at a rate subject to change from time to time.
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No definition available.
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| - Definition
Long-term debt issued during the period which accrues interest at a set, unchanging rate.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                   |
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| - Definition
This element represents the maximum remaining maturity of outstanding medium-term notes.
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No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.
+ References
No definition available.
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