Debt Maturities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Maturities [Abstract]
Debt maturities - 2012	$ 36,755
Debt maturities - 2013	16,255
Debt maturities - 2014	14,146
Debt maturities - 2015	6,079
Debt maturities 2016	7,950
Debt maturities - Thereafter	8,073
Total debt	89,258	84,659
Unamortized discount - 2012	(1)
Unamortized discount - 2013	(76)
Unamortized discount - 2014	(19)
Unamortized discount - 2015	(15)
Unamortized discount - 2016	(15)
Unamortized discount - Thereafter	(2)
Total unamortized discount	(128)	(149)
Fair value adjustments - 2012	33
Fair value adjustments - 2013	25
Fair value adjustments - 2014	84
Fair value adjustments - 2015	43
Fair value adjustments - 2016	148
Fair value adjustments - Thereafter	458
Total fair value adjustments	791	681
Unsecured Debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	13,567
Debt maturities - 2013	3,965
Debt maturities - 2014	9,093
Debt maturities - 2015	4,750
Debt maturities 2016	6,231
Debt maturities - Thereafter	7,617
Total debt	45,223
Asset-backed Securities [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	23,156
Debt maturities - 2013	12,341
Debt maturities - 2014	4,988
Debt maturities - 2015	1,301
Debt maturities 2016	1,586
Debt maturities - Thereafter	0
Total debt	43,372
Short-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	17,378
Long-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	19,377
Unsecured Debt Maturing Primarily by 2021 [Member]
Debt Maturities [Abstract]
Debt maturities - Thereafter	$ 7,600

Fair value adjustment as of the balance sheet date related to designated fair value hedges of unsecured debt.

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Fair value adjustment as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, for debt which is due in the current calendar year.

+ References

No definition available.

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Fair value adjustment as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due after the fifth calendar year after the balance sheet date.

+ References

No definition available.

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized, for debt which is due in the current calendar year.

+ References

No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized as of the balance sheet date, which is due after the fifth calendar year after the balance sheet date.

+ References

No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized, for debt which is due in the fifth calendar year after the balance sheet date.

+ References

No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized, for debt which is due in the fourth calendar year after the balance sheet date.

+ References

No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized, for debt which is due in the third calendar year after the balance sheet date.

+ References

No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument, which has yet to be amortized, for debt which is due in the second calendar year after the balance sheet date.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due in the current calendar year.

+ References

No definition available.

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Carrying value as of the balance sheet date of the sum of short-term debt and current and non-current maturities of long-term debt and capital lease obligations, which are due after the fifth calendar year after the balance sheet date.

+ References

No definition available.

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Carrying value as of the balance sheet date of the sum of short-term debt and current and non-current maturities of long-term debt and capital lease obligations, which are due in the fifth calendar year after the balance sheet date.

+ References

No definition available.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-Paragraph 16

-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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