Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, notional amount	$ 573,577	$ 515,302
Derivative asset, fair value	5,868	5,152
Derivative liability, fair value	9,737	3,570
Derivative asset, fair value offset amount	1,774	928
Derivative liability, fair value offset amount	1,774	928
Derivative asset, cash collateral	1,282	604
Derivative liability, cash collateral	2,572	1,657
Derivative asset, net fair value	2,812	3,620
Derivative liability, net fair value	5,391	985
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	2,575	1,363
Derivative liability, fair value	2,673	1,373
Derivative asset, cash collateral	105	1
Derivative liability, cash collateral	1,548	784
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	977	208
Derivative liability, fair value	689	542
Derivative asset, cash collateral	387	10
Derivative liability, cash collateral	9	97
Designated as Hedging Instruments under GAAP
Derivative [Line Items]
Derivative, notional amount	65,265	73,419
Derivative asset, fair value	176	15
Derivative liability, fair value	171	38
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	22,222	23,345
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	41,700	48,961
Derivative asset, fair value		15
Derivative liability, fair value	170	14
Designated as Hedging Instruments under GAAP \| Net investment hedges \| Foreign exchange contracts:
Derivative [Line Items]
Derivative, notional amount	1,343	1,113
Derivative asset, fair value	176
Derivative liability, fair value	1	24
Not Designated as Hedging Instrument under GAAP
Derivative [Line Items]
Derivative, notional amount	508,312	441,883
Derivative asset, fair value	5,692	5,137
Derivative liability, fair value	9,566	3,532
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	88,360	62,357
Derivative asset, fair value	345	101
Derivative liability, fair value	176	43
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	55,098	35,623
Derivative liability, fair value	35
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	7,020	4,592
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	5,539	9,917
Derivative asset, fair value	170	55
Derivative liability, fair value	125	31
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	20,703	12,225
Derivative asset, fair value	175	46
Derivative liability, fair value	16	12
Not Designated as Hedging Instrument under GAAP \| Customer Contracts
Derivative [Line Items]
Derivative, notional amount	408,022	368,014
Derivative asset, fair value	5,147	5,027
Derivative liability, fair value	9,268	3,150
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	365,863	328,483
Derivative asset, fair value	1,971	3,465
Derivative liability, fair value	6,029	1,598
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	13,175	11,968
Derivative asset, fair value	2,575	1,363
Derivative liability, fair value	2,673	1,373
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	28,984	27,563
Derivative asset, fair value	601	199
Derivative liability, fair value	566	179
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	333,106	297,711
Derivative asset, fair value	1,593	3,335
Derivative liability, fair value	5,693	1,520
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	7,868	8,840
Derivative asset, fair value	2,105	1,150
Derivative liability, fair value	2,206	1,161
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	896	907
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	2,119	4,147
Derivative asset, fair value	39	5
Derivative liability, fair value	16	6
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	29,742	25,718
Derivative asset, fair value	339	125
Derivative liability, fair value	320	72
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	5,307	3,128
Derivative asset, fair value	470	213
Derivative liability, fair value	467	212
Not Designated as Hedging Instrument under GAAP \| Other Risk Management Activity \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	11,930	11,512
Derivative asset, fair value	200	9
Derivative liability, fair value	$ 122	$ 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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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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