Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, notional amount	$ 553,293	$ 515,302
Derivative asset, fair value	5,392	5,152
Derivative liability, fair value	7,590	3,570
Derivative asset, fair value offset amount	1,577	928
Derivative liability, fair value offset amount	1,577	928
Derivative asset, cash collateral	578	604
Derivative liability, cash collateral	2,288	1,657
Derivative asset, net fair value	3,237	3,620
Derivative liability, net fair value	3,725	985
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	3,134	1,363
Derivative liability, fair value	3,230	1,373
Derivative asset, cash collateral	138	1
Derivative liability, cash collateral	1,513	784
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	522	208
Derivative liability, fair value	545	542
Derivative asset, cash collateral	122	10
Derivative liability, cash collateral	14	97
Designated as Hedging Instruments under GAAP
Derivative [Line Items]
Derivative, notional amount	69,246	73,419
Derivative asset, fair value	104	15
Derivative liability, fair value	41	38
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	21,579	23,345
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	46,432	48,961
Derivative asset, fair value	19	15
Derivative liability, fair value	40	14
Designated as Hedging Instruments under GAAP \| Net investment hedges \| Foreign exchange contracts:
Derivative [Line Items]
Derivative, notional amount	1,235	1,113
Derivative asset, fair value	85
Derivative liability, fair value	1	24
Not Designated as Hedging Instrument under GAAP
Derivative [Line Items]
Derivative, notional amount	484,047	441,883
Derivative asset, fair value	5,288	5,137
Derivative liability, fair value	7,549	3,532
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	75,285	62,357
Derivative asset, fair value	198	101
Derivative liability, fair value	79	43
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	45,412	35,623
Derivative liability, fair value	3
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	5,228	4,592
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	6,189	9,917
Derivative asset, fair value	74	55
Derivative liability, fair value	61	31
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	18,456	12,225
Derivative asset, fair value	124	46
Derivative liability, fair value	15	12
Not Designated as Hedging Instrument under GAAP \| Customer Contracts
Derivative [Line Items]
Derivative, notional amount	397,570	368,014
Derivative asset, fair value	5,028	5,027
Derivative liability, fair value	7,255	3,150
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	353,530	328,483
Derivative asset, fair value	1,519	3,465
Derivative liability, fair value	3,696	1,598
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	14,966	11,968
Derivative asset, fair value	3,134	1,363
Derivative liability, fair value	3,230	1,373
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	29,074	27,563
Derivative asset, fair value	375	199
Derivative liability, fair value	329	179
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	320,717	297,711
Derivative asset, fair value	1,259	3,335
Derivative liability, fair value	3,459	1,520
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	8,917	8,840
Derivative asset, fair value	2,469	1,150
Derivative liability, fair value	2,567	1,161
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	520	907
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	2,181	4,147
Derivative asset, fair value	10	5
Derivative liability, fair value	8	6
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	30,112	25,718
Derivative asset, fair value	250	125
Derivative liability, fair value	229	72
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	6,049	3,128
Derivative asset, fair value	665	213
Derivative liability, fair value	663	212
Not Designated as Hedging Instrument under GAAP \| Other Risk Management Activity \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	11,192	11,512
Derivative asset, fair value	62	9
Derivative liability, fair value	$ 215	$ 339

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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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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