Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ (23)	$ 209
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	90,752		93,671
Fair Value of Derivative Assets	668		585
Fair Value of Derivative Liabilities	470		506
Counterparty Risk [Abstract]
Derivative asset instruments, increase/(decrease) in adjustment for non-performance risk	2		2
Derivative liability instruments, increase/(decrease) in adjustment for non-performance risk	(12)		(25)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(307)		(296)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(307)		(296)
Derivative Asset	361		289
Derivative Liability	163		210
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(28)	215
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	72,115		74,893
Fair Value of Derivative Assets	330		225
Fair Value of Derivative Liabilities	295		327
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(18)	2
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	66,917		69,863
Fair Value of Derivative Assets	325		224
Fair Value of Derivative Liabilities	109		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	105	(91)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(100)	85
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	69	61
Ineffectiveness	5	(6)
Derivative, Gain (Loss) on Derivative, Net	74	55
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	18,637		18,778
Fair Value of Derivative Assets	338		360
Fair Value of Derivative Liabilities	175		179
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(5)	75
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,271		2,410
Fair Value of Derivative Assets	4		1
Fair Value of Derivative Liabilities	21		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	(5)	138
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,927		2,620
Fair Value of Derivative Assets	1		0
Fair Value of Derivative Liabilities	$ 165		$ 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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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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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-Publisher FASB

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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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