Financial Derivatives (Derivative Assets and Liabilitites Offsetting) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	$ 5,234,000,000	$ 4,793,000,000
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	4,027,000,000	3,934,000,000
Liability [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	4,027,000,000	3,934,000,000
Derivative Liability, Fair Value Offset Amount	2,141,000,000	2,533,000,000
Derivative Liability, Cash Collateral	503,000,000	497,000,000
Derivative Liability, Net Fair Value	1,383,000,000	904,000,000
Derivative Liability, Net	1,383,000,000	904,000,000
Exchange Cleared [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	657,000,000	224,000,000
Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	5,234,000,000	4,793,000,000
Derivative Asset, Fair Value Offset Amount	2,141,000,000	2,533,000,000
Derivative Asset, Cash Collateral	506,000,000	565,000,000
Derivative Asset, Net Fair Value	2,587,000,000	1,695,000,000
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	144,000,000	115,000,000
Derivative Asset, Net	2,443,000,000	1,580,000,000
Exchange Cleared [Member]
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	807,000,000	331,000,000
Interest Rate Contracts [Member] \| Liability [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	3,272,000,000	3,326,000,000
Derivative Liability, Fair Value Offset Amount	2,057,000,000	2,447,000,000
Derivative Liability, Cash Collateral	483,000,000	473,000,000
Derivative Liability, Net Fair Value	732,000,000	406,000,000
Derivative Liability, Net	732,000,000	406,000,000
Interest Rate Contracts [Member] \| Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	4,918,000,000	4,599,000,000
Derivative Asset, Fair Value Offset Amount	1,981,000,000	2,468,000,000
Derivative Asset, Cash Collateral	458,000,000	556,000,000
Derivative Asset, Net Fair Value	2,479,000,000	1,575,000,000
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	143,000,000	115,000,000
Derivative Asset, Net	2,336,000,000	1,460,000,000
Foreign Exchange Contract [Member] \| Liability [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	241,000,000	182,000,000
Derivative Liability, Fair Value Offset Amount	80,000,000	83,000,000
Derivative Liability, Cash Collateral	20,000,000	23,000,000
Derivative Liability, Net Fair Value	141,000,000	76,000,000
Derivative Liability, Net	141,000,000	76,000,000
Foreign Exchange Contract [Member] \| Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	314,000,000	192,000,000
Derivative Asset, Fair Value Offset Amount	159,000,000	64,000,000
Derivative Asset, Cash Collateral	47,000,000	9,000,000
Derivative Asset, Net Fair Value	108,000,000	119,000,000
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	1,000,000
Derivative Asset, Net	107,000,000	119,000,000
Credit Risk Contract [Member] \| Liability [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	4,000,000	4,000,000
Derivative Liability, Fair Value Offset Amount	4,000,000	3,000,000
Derivative Liability, Cash Collateral		1,000,000
Credit Risk Contract [Member] \| Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	2,000,000	2,000,000
Derivative Asset, Fair Value Offset Amount	1,000,000	1,000,000
Derivative Asset, Cash Collateral	1,000,000
Derivative Asset, Net Fair Value		1,000,000
Derivative Asset, Net		1,000,000
Other Contract [Member] \| Liability [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	510,000,000	422,000,000
Derivative Liability, Net Fair Value	510,000,000	422,000,000
Derivative Liability, Net	$ 510,000,000	$ 422,000,000

Fair value of the gross assets less the offsetting amount of derivative assets.

No definition available.

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- Definition

The amount of setoff associated with the entity's recognized derivative assets with corresponding derivative liability amounts subject to an enforceable master netting agreement or similar agreement.

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No definition available.

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- Definition

Fair value of the gross liabilities less the amount of offsetting amount of derivative liabilities.

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No definition available.

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The amount of setoff associated with the entity's recognized derivative liabilities with corresponding derivative asset amounts subject to an enforceable master netting agreement or similar agreement.

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No definition available.

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- Definition

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Fair value of securities received as collateral against derivative assets.

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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. Includes assets elected not to be offset. Excludes assets not subject to 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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 liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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