Financial Derivatives (Derivative Assets and Liabilitites Offsetting) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets [Abstract]
Derivative Asset, Gross Fair Value	$ 2,368	$ 2,081
Derivative Asset, Fair Value Offset Amount	695	688
Derivative Asset, Cash Collateral	302	341
Derivative Asset, Net	1,371	1,052
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	70	25
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,301	1,027
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Gross Fair Value	1,905	2,290
Derivative Liability, Fair Value Offset Amount	695	688
Derivative Liability, Cash Collateral	626	539
Derivative Liability, Net	584	1,063
Derivative Liability, Fair Value of Collateral		11
Derivative Liability, Fair Value, Amount Offset Against Collateral	584	1,052
Interest Rate Contracts [Member] \| Over the Counter Cleared [Member]
Offsetting Derivative Assets [Abstract]
Derivative Asset, Gross Fair Value	18	29
Derivative Asset, Net	18	29
Derivative Asset, Fair Value, Amount Offset Against Collateral	18	29
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Gross Fair Value	23	24
Derivative Liability, Net	23	24
Derivative Liability, Fair Value, Amount Offset Against Collateral	23	24
Interest Rate Contracts [Member] \| Over the Counter [Member]
Offsetting Derivative Assets [Abstract]
Derivative Asset, Gross Fair Value	1,965	1,472
Derivative Asset, Fair Value Offset Amount	431	450
Derivative Asset, Cash Collateral	295	117
Derivative Asset, Net	1,239	905
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	70	25
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,169	880
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Gross Fair Value	1,297	1,496
Derivative Liability, Fair Value Offset Amount	543	557
Derivative Liability, Cash Collateral	537	489
Derivative Liability, Net	217	450
Derivative Liability, Fair Value of Collateral		11
Derivative Liability, Fair Value, Amount Offset Against Collateral	217	439
Commodity Contract [Member]
Offsetting Derivative Assets [Abstract]
Derivative Asset, Gross Fair Value	159	311
Derivative Asset, Fair Value Offset Amount	117	76
Derivative Asset, Cash Collateral	1	210
Derivative Asset, Net	41	25
Derivative Asset, Fair Value, Amount Offset Against Collateral	41	25
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Gross Fair Value	154	305
Derivative Liability, Fair Value Offset Amount	90	56
Derivative Liability, Cash Collateral	39	17
Derivative Liability, Net	25	232
Derivative Liability, Fair Value, Amount Offset Against Collateral	25	232
Foreign Exchange And Other Contract [Member]
Offsetting Derivative Assets [Abstract]
Derivative Asset, Gross Fair Value	226	269
Derivative Asset, Fair Value Offset Amount	147	162
Derivative Asset, Cash Collateral	6	14
Derivative Asset, Net	73	93
Derivative Asset, Fair Value, Amount Offset Against Collateral	73	93
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Gross Fair Value	431	465
Derivative Liability, Fair Value Offset Amount	62	75
Derivative Liability, Cash Collateral	50	33
Derivative Liability, Net	319	357
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 319	$ 357

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

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Fair value of liability associated with 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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Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities.

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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 effects of master netting arrangements, 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 offset against the right to receive collateral. 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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Fair value of asset associated with 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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