Debt Maturities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Maturities [Abstract]
Debt maturities - 2013	$ 24,004
Debt maturities - 2014	19,908
Debt maturities - 2015	16,885
Debt maturities - 2016	11,538
Debt maturities 2017	7,971
Debt maturities - Thereafter	10,415
DebtAndCapitalLeaseObligationTotal	90,721
Total debt	90,822	89,258
Total unamortized discount	(109)	(128)
Total fair value adjustments	210	791
Unsecured Debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	10,639
Debt maturities - 2014	5,122
Debt maturities - 2015	9,087
Debt maturities - 2016	7,317
Debt maturities 2017	6,153
Debt maturities - Thereafter	9,737
Total debt	48,055
Asset-backed Securities [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	13,365
Debt maturities - 2014	14,786
Debt maturities - 2015	7,798
Debt maturities - 2016	4,221
Debt maturities 2017	1,818
Debt maturities - Thereafter	678
Total debt	42,666
Short-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	12,698
Debt maturities - 2014	803
Long-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	11,306
Debt maturities - 2014	19,105
Unsecured Debt Maturing Primarily by 2023 [Member]
Debt Maturities [Abstract]
Debt maturities - Thereafter	$ 9,729

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

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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 before unamortized discount and fair value adjustments.

+ 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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- Definition

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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- Definition

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

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-SubTopic 210

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- Definition

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

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

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-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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