Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ 209	$ (156)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	88,667		90,369
Fair Value of Derivative Assets	1,275		1,256
Fair Value of Derivative Liabilities	251		400
Counterparty Risk [Abstract]
Derivative asset instruments, adjustment for non-performance risk	14		14
Derivative liability instruments, adjustment for non-performance risk	9		5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(174)		(225)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(174)		(225)
Derivative, Collateral, Obligation to Return Cash	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Assets	1,101		1,031
Derivative Liabilities	77		175
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	215	(157)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	70,523		73,615
Fair Value of Derivative Assets	552		469
Fair Value of Derivative Liabilities	223		392
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	2	(9)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	65,203		68,622
Fair Value of Derivative Assets	458		460
Fair Value of Derivative Liabilities	187		248
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	61	41
Ineffectiveness	(6)	1
Gain (loss) recognized in income	55	42
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(91)	(80)
Change in fair value of hedged debt, gain	85	81
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	18,144		16,754
Fair Value of Derivative Assets	723		787
Fair Value of Derivative Liabilities	28		8
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	75	(62)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	1,971		1,987
Fair Value of Derivative Assets	49		9
Fair Value of Derivative Liabilities	10		27
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	138	(48)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	3,349		3,006
Fair Value of Derivative Assets	45		0
Fair Value of Derivative Liabilities	26		117
Other Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ 0	$ (38)

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Adjustment to derivative assets for non-performance risk.

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Adjustment to derivative liabilities for non-performance risk.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

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The amount recognized in earnings related to the change in fair value during the period of derivative or nonderivative instruments designated as fair value hedging instruments.

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The amount recognized in earnings related to the change in fair value during the period of the hedged item in a fair value hedge.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.

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The amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.

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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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The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was not offset against an obligation to return cash collateral under a master netting arrangement.

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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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The amount as of the balance sheet date of the fair value of derivative liabilities that in accordance with the entity's accounting policy was not offset against the right to reclaim cash collateral under a master netting arrangement.

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate fair value hedging instruments excluded from the assessment of fair value hedge effectiveness.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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