Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 476,275	$ 443,379
Derivative Asset, Fair Value	8,179	3,502
Derivative Liability, Fair Value	3,229	2,019
Derivative Asset, Fair Value Offset Amount	1,196	690
Derivative Liability, Fair Value Offset Amount	1,196	690
Derivative Asset, Cash Collateral	1,825	616
Derivative Liability, Cash Collateral	1,229	790
Derivative Asset, Net Fair Value	5,158	2,196
Derivative Liability, Net Fair Value	804	539
Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	657	306
Derivative Liability, Fair Value	635	301
Derivative Asset, Cash Collateral	61	18
Derivative Liability, Cash Collateral	25	17
Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	410	213
Derivative Liability, Fair Value	476	425
Derivative Asset, Cash Collateral	7	5
Derivative Liability, Cash Collateral	93	81
Designated as Hedging Instruments under GAAP [Member]
Derivative [Line Items]
Derivative, Notional Amount	45,410	55,407
Derivative Asset, Fair Value	82	6
Derivative Liability, Fair Value		6
Designated as Hedging Instruments under GAAP [Member] \| Fair Value Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	27,874	30,663
Designated as Hedging Instruments under GAAP [Member] \| Cash Flow Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	16,342	23,642
Derivative Asset, Fair Value	7	6
Designated as Hedging Instruments under GAAP [Member] \| Net Investment Hedging [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,194	1,102
Derivative Asset, Fair Value	75
Derivative Liability, Fair Value		6
Not Designated as Hedging Instrument under GAAP [Member]
Derivative [Line Items]
Derivative, Notional Amount	430,865	387,972
Derivative Asset, Fair Value	8,097	3,496
Derivative Liability, Fair Value	3,229	2,013
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	80,689	66,366
Derivative Asset, Fair Value	210	93
Derivative Liability, Fair Value	144	67
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	55,678	52,007
Derivative Asset, Fair Value		1
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,359	3,487
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Mortgage Commitment [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	16,569	7,738
Derivative Asset, Fair Value	175	60
Derivative Liability, Fair Value	105	44
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Other Contract [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,083	3,134
Derivative Asset, Fair Value	35	32
Derivative Liability, Fair Value	39	23
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	340,523	311,405
Derivative Asset, Fair Value	7,834	3,394
Derivative Liability, Fair Value	2,883	1,689
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	306,785	274,878
Derivative Asset, Fair Value	6,895	2,884
Derivative Liability, Fair Value	1,974	1,226
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	8,964	9,407
Derivative Asset, Fair Value	657	306
Derivative Liability, Fair Value	635	301
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	24,774	27,120
Derivative Asset, Fair Value	282	204
Derivative Liability, Fair Value	274	162
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	278,337	249,075
Derivative Asset, Fair Value	6,584	2,769
Derivative Liability, Fair Value	1,854	1,187
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	5,313	5,204
Derivative Asset, Fair Value	531	234
Derivative Liability, Fair Value	509	229
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,375	703
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Mortgage Commitment [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,745	3,721
Derivative Asset, Fair Value	19	2
Derivative Liability, Fair Value	16	6
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	23,328	21,379
Derivative Asset, Fair Value	292	113
Derivative Liability, Fair Value	104	33
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,651	4,203
Derivative Asset, Fair Value	126	72
Derivative Liability, Fair Value	126	72
Not Designated as Hedging Instrument under GAAP [Member] \| Other Risk Management Activity [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	9,653	10,201
Derivative Asset, Fair Value	53	9
Derivative Liability, Fair Value	$ 202	$ 257

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

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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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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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