Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ 158	$ (207)	$ 95	$ (62)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	84,387		84,387		93,671
Fair Value of Derivative Assets	751		751		585
Fair Value of Derivative Liabilities	291		291		506
Counterparty Risk [Abstract]
Derivative asset instruments, increase/(decrease) in adjustment for non-performance risk	(2)		(2)		2
Derivative liability instruments, increase/(decrease) in adjustment for non-performance risk	(9)		(9)		(25)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(242)		(242)		(296)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(242)		(242)		(296)
Derivative Asset	509		509		289
Derivative Liability	49		49		210
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	160	(204)	87	(29)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	61,444		61,444		74,893
Fair Value of Derivative Assets	327		327		225
Fair Value of Derivative Liabilities	134		134		327
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(10)	(18)	(37)	(20)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	56,607		56,607		69,863
Fair Value of Derivative Assets	254		254		224
Fair Value of Derivative Liabilities	78		78		126
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(88)	67	179	(501)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	86	(70)	(171)	468
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	79	63	220	186
Ineffectiveness	(2)	(3)	8	(33)
Derivative, Gain (Loss) on Derivative, Net	77	60	228	153
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	22,943		22,943		18,778
Fair Value of Derivative Assets	424		424		360
Fair Value of Derivative Liabilities	157		157		179
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	52	(55)	22	28
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,324		2,324		2,410
Fair Value of Derivative Assets	56		56		1
Fair Value of Derivative Liabilities	12		12		25
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	118	(131)	102	(37)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,513		2,513		2,620
Fair Value of Derivative Assets	17		17		0
Fair Value of Derivative Liabilities	$ 44		$ 44		$ 176

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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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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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