Financial Derivatives (Derivative Assets and Liabilitites Offsetting) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	$ 2,081	$ 2,874
Derivative Asset, Fair Value Offset Amount	688	1,054
Derivative Asset, Cash Collateral	341	636
Derivative Asset, Net Fair Value	1,052	1,184
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	2,290	2,856
Derivative Liability, Fair Value Offset Amount	688	1,054
Derivative Liability, Cash Collateral	539	763
Derivative Liability, Net Fair Value	1,063	1,039
Liability
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	2,290	2,856
Derivative Liability, Fair Value Offset Amount	688	1,054
Derivative Liability, Cash Collateral	539	763
Derivative Liability, Net Fair Value	1,063	1,039
Derivative Liability, Fair Value of Collateral	11
Derivative Liability	1,052	1,039
Assets
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	2,081	2,874
Derivative Asset, Fair Value Offset Amount	688	1,054
Derivative Asset, Cash Collateral	341	636
Derivative Asset, Net Fair Value	1,052	1,184
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	25	32
Derivative Asset, Net	1,027	1,152
Interest Rate Contract \| Liability \| Exchange Cleared, Liability
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	24	260
Derivative Liability, Fair Value Offset Amount		251
Derivative Liability, Net Fair Value	24	9
Derivative Liability	24	9
Interest Rate Contract \| Liability \| Over The Counter, Liability
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	1,496	1,703
Derivative Liability, Fair Value Offset Amount	557	662
Derivative Liability, Cash Collateral	489	669
Derivative Liability, Net Fair Value	450	372
Derivative Liability, Fair Value of Collateral	11
Derivative Liability	439	372
Interest Rate Contract \| Assets \| Exchange Cleared
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	29	827
Derivative Asset, Fair Value Offset Amount		251
Derivative Asset, Cash Collateral		567
Derivative Asset, Net Fair Value	29	9
Derivative Asset, Net	29	9
Interest Rate Contract \| Assets \| Over the Counter
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	1,472	1,695
Derivative Asset, Fair Value Offset Amount	450	668
Derivative Asset, Cash Collateral	117	67
Derivative Asset, Net Fair Value	905	960
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	25	32
Derivative Asset, Net	880	928
Commodity Contracts \| Liability
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	305	126
Derivative Liability, Fair Value Offset Amount	56	38
Derivative Liability, Cash Collateral	17
Derivative Liability, Net Fair Value	232	88
Derivative Liability	232	88
Commodity Contracts \| Assets
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	311	130
Derivative Asset, Fair Value Offset Amount	76	38
Derivative Asset, Cash Collateral	210
Derivative Asset, Net Fair Value	25	92
Derivative Asset, Net	25	92
Foreign Exchange And Other Contract \| Liability
Offsetting Liabilities [Line Items]
Derivative Liability, Gross Fair Value	465	767
Derivative Liability, Fair Value Offset Amount	75	103
Derivative Liability, Cash Collateral	33	94
Derivative Liability, Net Fair Value	357	570
Derivative Liability	357	570
Foreign Exchange And Other Contract \| Assets
Offsetting Assets [Line Items]
Derivative Asset, Gross Fair Value	269	222
Derivative Asset, Fair Value Offset Amount	162	97
Derivative Asset, Cash Collateral	14	2
Derivative Asset, Net Fair Value	93	123
Derivative Asset, Net	$ 93	$ 123

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

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

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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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Fair value of securities received as collateral against derivative assets.

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Fair value of securities pledged as collateral against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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