Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ (207)	$ (78)	$ (62)	$ (276)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	93,296		93,296		90,369
Fair Value of Derivative Assets	865		865		1,256
Fair Value of Derivative Liabilities	555		555		400
Counterparty Risk [Abstract]
Derivative asset instruments, adjustment for non-performance risk	4		4		(14)
Derivative liability instruments, adjustment for non-performance risk	(20)		(20)		(5)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(353)		(353)		(225)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(353)		(353)		(225)
Fair Value of Derivative Assets	865		865		1,256
Fair Value of Derivative Liabilities	555		555		400
Derivative Assets	512		512		1,031
Derivative Liabilities	202		202		175
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(204)	(84)	(29)	(284)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	73,962		73,962		73,615
Fair Value of Derivative Assets	398		398		469
Fair Value of Derivative Liabilities	383		383		392
Counterparty Risk [Abstract]
Fair Value of Derivative Assets	398		398		469
Fair Value of Derivative Liabilities	383		383		392
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(18)	(13)	(20)	(27)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	67,768		67,768		68,622
Fair Value of Derivative Assets	386		386		460
Fair Value of Derivative Liabilities	147		147		248
Counterparty Risk [Abstract]
Fair Value of Derivative Assets	386		386		460
Fair Value of Derivative Liabilities	147		147		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	63	44	186	126
Ineffectiveness	(3)	6	(33)	8
Gain (loss) recognized in income	60	50	153	134
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	67	118	(501)	276
Change in fair value of hedged debt, gain/(loss)	(70)	(112)	468	(268)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	19,334		19,334		16,754
Fair Value of Derivative Assets	467		467		787
Fair Value of Derivative Liabilities	172		172		8
Counterparty Risk [Abstract]
Fair Value of Derivative Assets	467		467		787
Fair Value of Derivative Liabilities	172		172		8
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(55)	(10)	28	(67)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,942		2,942		1,987
Fair Value of Derivative Assets	12		12		9
Fair Value of Derivative Liabilities	65		65		27
Counterparty Risk [Abstract]
Fair Value of Derivative Assets	12		12		9
Fair Value of Derivative Liabilities	65		65		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	(131)	(61)	(37)	(109)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	3,252		3,252		3,006
Fair Value of Derivative Assets	0		0		0
Fair Value of Derivative Liabilities	171		171		117
Counterparty Risk [Abstract]
Fair Value of Derivative Assets	0		0		0
Fair Value of Derivative Liabilities	171		171		117
Other Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ 0	$ 0	$ 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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