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Derivative Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Notional Amount	$ 49,439	$ 45,623
Estimated Fair Value Assets	2,529	2,766
Estimated Fair Value Liabilities	876	680
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	2,346	2,329
Estimated Fair Value Assets	290	478
Estimated Fair Value Liabilities	38	37
Designated as Hedging Instrument [Member] \| Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	652	909
Estimated Fair Value Assets	35	223
Estimated Fair Value Liabilities	25	25
Designated as Hedging Instrument [Member] \| Fair Value Hedges [Member] \| Foreign currency swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	122	598
Estimated Fair Value Assets	0	188
Estimated Fair Value Liabilities	15	19
Designated as Hedging Instrument [Member] \| Fair Value Hedges [Member] \| Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	530	311
Estimated Fair Value Assets	35	35
Estimated Fair Value Liabilities	10	6
Designated as Hedging Instrument [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,694	1,420
Estimated Fair Value Assets	255	255
Estimated Fair Value Liabilities	13	12
Designated as Hedging Instrument [Member] \| Cash Flow Hedges [Member] \| Foreign currency swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	521	445
Estimated Fair Value Assets	22	31
Estimated Fair Value Liabilities	13	12
Designated as Hedging Instrument [Member] \| Cash Flow Hedges [Member] \| Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	708	355
Estimated Fair Value Assets	130	96
Estimated Fair Value Liabilities	0	0
Designated as Hedging Instrument [Member] \| Cash Flow Hedges [Member] \| Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	465	620
Estimated Fair Value Assets	103	128
Estimated Fair Value Liabilities	$ 0	$ 0

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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