Debt Maturities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt Maturities [Abstract]
Debt maturities - 2012	$ 15,650
Debt maturities - 2013	21,417
Debt maturities - 2014	14,749
Debt maturities - 2015	12,676
Debt maturities 2016	5,709
Debt maturities - Thereafter	14,513
Total debt	84,714	84,659
Unamortized discount - 2012	0
Unamortized discount - 2013	(6)
Unamortized discount - 2014	(86)
Unamortized discount - 2015	(18)
Unamortized discount - 2016	(13)
Unamortized discount - Thereafter	(15)
Total unamortized discount	(138)	(149)
Fair value adjustments - 2012	0
Fair value adjustments - 2013	43
Fair value adjustments - 2014	29
Fair value adjustments - 2015	93
Fair value adjustments - 2016	46
Fair value adjustments - Thereafter	656
Total fair value adjustments	867	681
Unsecured Debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	6,539
Debt maturities - 2013	6,649
Debt maturities - 2014	3,694
Debt maturities - 2015	8,878
Debt maturities 2016	4,807
Debt maturities - Thereafter	12,377
Total debt	42,944
Asset-backed Securities [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	9,111
Debt maturities - 2013	14,731
Debt maturities - 2014	11,112
Debt maturities - 2015	3,723
Debt maturities 2016	869
Debt maturities - Thereafter	1,495
Total debt	41,041
Short-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	10,970
Debt maturities - 2013	3,105
Long-term debt [Member]
Debt Maturities [Abstract]
Debt maturities - 2012	4,680
Debt maturities - 2013	18,312
Unsecured Debt Maturing Primarily by 2021 [Member]
Debt Maturities [Abstract]
Debt maturities - Thereafter	$ 10,449

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

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, 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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- 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 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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- 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 fourth 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 third calendar year after the balance sheet date.

+ References

No definition available.

+ Details

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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 second calendar year after the balance sheet date.

+ References

No definition available.

+ Details

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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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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)

-Number 21

-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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