Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, notional amount	$ 548,311	$ 515,302
Derivative asset, fair value	5,935	5,152
Derivative liability, fair value	6,963	3,570
Derivative asset, fair value offset amount	1,439	928
Derivative liability, fair value offset amount	1,439	928
Derivative asset, cash collateral	491	604
Derivative liability, cash collateral	2,611	1,657
Derivative asset, net fair value	4,005	3,620
Derivative liability, net fair value	2,913	985
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	3,446	1,363
Derivative liability, fair value	3,448	1,373
Derivative asset, cash collateral	183	1
Derivative liability, cash collateral	1,917	784
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	280	208
Derivative liability, fair value	493	542
Derivative asset, cash collateral	31	10
Derivative liability, cash collateral	45	97
Designated as Hedging Instruments under GAAP
Derivative [Line Items]
Derivative, notional amount	74,510	73,419
Derivative asset, fair value	12	15
Derivative liability, fair value	150	38
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	21,066	23,345
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	52,289	48,961
Derivative asset, fair value	6	15
Derivative liability, fair value	150	14
Designated as Hedging Instruments under GAAP \| Net investment hedges \| Foreign exchange contracts:
Derivative [Line Items]
Derivative, notional amount	1,155	1,113
Derivative asset, fair value	6
Derivative liability, fair value		24
Not Designated as Hedging Instrument under GAAP
Derivative [Line Items]
Derivative, notional amount	473,801	441,883
Derivative asset, fair value	5,923	5,137
Derivative liability, fair value	6,813	3,532
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	75,248	62,357
Derivative asset, fair value	263	101
Derivative liability, fair value	141	43
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	40,360	35,623
Derivative liability, fair value	11
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	5,168	4,592
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	11,998	9,917
Derivative asset, fair value	148	55
Derivative liability, fair value	116	31
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	17,722	12,225
Derivative asset, fair value	115	46
Derivative liability, fair value	14	12
Not Designated as Hedging Instrument under GAAP \| Customer Contracts
Derivative [Line Items]
Derivative, notional amount	385,649	368,014
Derivative asset, fair value	5,641	5,027
Derivative liability, fair value	6,404	3,150
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	341,480	328,483
Derivative asset, fair value	1,940	3,465
Derivative liability, fair value	2,731	1,598
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	15,849	11,968
Derivative asset, fair value	3,446	1,363
Derivative liability, fair value	3,448	1,373
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	28,320	27,563
Derivative asset, fair value	255	199
Derivative liability, fair value	225	179
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	307,436	297,711
Derivative asset, fair value	1,687	3,335
Derivative liability, fair value	2,530	1,520
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	9,687	8,840
Derivative asset, fair value	2,767	1,150
Derivative liability, fair value	2,773	1,161
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	849	907
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	4,349	4,147
Derivative asset, fair value	39	5
Derivative liability, fair value	26	6
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	28,846	25,718
Derivative asset, fair value	214	125
Derivative liability, fair value	175	72
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	6,162	3,128
Derivative asset, fair value	679	213
Derivative liability, fair value	675	212
Not Designated as Hedging Instrument under GAAP \| Other Risk Management Activity \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	12,904	11,512
Derivative asset, fair value	19	9
Derivative liability, fair value	$ 268	$ 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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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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