Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ (64)	$ (42)	$ 145	$ (198)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	86,466		86,466		90,369
Fair Value of Derivative Assets	784		784		1,256
Fair Value of Derivative Liabilities	380		380		400
Counterparty Risk [Abstract]
Derivative asset instruments, adjustment for non-performance risk	5		5		14
Derivative liability instruments, adjustment for non-performance risk	25		25		5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(278)		(278)		(225)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(278)		(278)		(225)
Derivative Assets	506		506		1,031
Derivative Liabilities	102		102		175
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(40)	(43)	175	(200)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	67,151		67,151		73,615
Fair Value of Derivative Assets	350		350		469
Fair Value of Derivative Liabilities	212		212		392
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(4)	(5)	(2)	(14)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	62,675		62,675		68,622
Fair Value of Derivative Assets	310		310		460
Fair Value of Derivative Liabilities	148		148		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	62	41	123	82
Ineffectiveness	(24)	1	(30)	2
Gain (loss) recognized in income	38	42	93	84
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(477)	238	(568)	158
Change in fair value of hedged debt, gain/(loss)	453	(237)	538	(156)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	19,315		19,315		16,754
Fair Value of Derivative Assets	434		434		787
Fair Value of Derivative Liabilities	168		168		8
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	8	5	83	(57)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	1,357		1,357		1,987
Fair Value of Derivative Assets	14		14		9
Fair Value of Derivative Liabilities	6		6		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	(44)	0	94	(48)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	3,119		3,119		3,006
Fair Value of Derivative Assets	26		26		0
Fair Value of Derivative Liabilities	58		58		117
Other Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ 0	$ (43)	$ 0	$ (81)

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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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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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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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