Debt Maturities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Maturities [Abstract]
Debt maturities - 2013	$ 17,847
Debt maturities - 2014	23,058
Debt maturities - 2015	18,604
Debt maturities - 2016	14,478
Debt maturities 2017	8,247
Debt maturities - Thereafter	12,093
DebtAndCapitalLeaseObligationTotal	94,327
Total debt	94,483	89,258
Total unamortized discount	(103)	(128)
Total fair value adjustments	259	791
Unsecured Debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	10,449
Debt maturities - 2014	5,912
Debt maturities - 2015	9,271
Debt maturities - 2016	8,212
Debt maturities 2017	6,219
Debt maturities - Thereafter	11,402
Total debt	51,465
Asset-backed Securities [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	7,398
Debt maturities - 2014	17,146
Debt maturities - 2015	9,333
Debt maturities - 2016	6,266
Debt maturities 2017	2,028
Debt maturities - Thereafter	691
Total debt	42,862
Short-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	12,086
Debt maturities - 2014	2,585
Long-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	5,761
Debt maturities - 2014	20,473
Unsecured Debt Maturing Primarily by 2023 [Member]
Debt Maturities [Abstract]
Debt maturities - Thereafter	$ 11,393

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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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

-Section S99

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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

-Publisher FASB

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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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