Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, notional amount	$ 1,141,175	$ 581,268
Derivative asset, fair value	3,220	3,768
Derivative liability, fair value	7,003	7,618
Derivative asset, fair value offset amount	1,303	1,523
Derivative liability, fair value offset amount	1,303	1,523
Derivative asset, cash collateral	1,134	714
Derivative liability, cash collateral	1,135	1,571
Derivative asset, net fair value	783	1,531
Derivative liability, net fair value	4,565	4,524
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	622	1,208
Derivative liability, fair value	649	1,269
Derivative asset, cash collateral	104	2
Derivative liability, cash collateral	23	520
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	342	437
Derivative liability, fair value	477	520
Derivative asset, cash collateral	119	82
Derivative liability, cash collateral	8	10
Mortgage Banking \| Overlay Swap \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	26,000
Customer Contracts \| Overlay Swap \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	423,000
Designated as Hedging Instruments under GAAP
Derivative [Line Items]
Derivative, notional amount	136,111	65,661
Derivative asset, fair value		24
Derivative liability, fair value	25	1
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	48,088	24,231
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Overlay Swap \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	18,800
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	86,922	40,310
Derivative liability, fair value	3	1
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Overlay Swap \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	47,000
Designated as Hedging Instruments under GAAP \| Net investment hedges \| Foreign exchange contracts:
Derivative [Line Items]
Derivative, notional amount	1,101	1,120
Derivative asset, fair value		24
Derivative liability, fair value	22
Not Designated as Hedging Instrument under GAAP
Derivative [Line Items]
Derivative, notional amount	1,005,064	515,607
Derivative asset, fair value	3,220	3,744
Derivative liability, fair value	6,978	7,617
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	99,341	75,978
Derivative asset, fair value	133	182
Derivative liability, fair value	76	104
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	73,477	47,908
Derivative asset, fair value		7
Derivative liability, fair value	1	1
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	8,026	5,537
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	5,277	4,516
Derivative asset, fair value	68	85
Derivative liability, fair value	63	89
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	12,561	18,017
Derivative asset, fair value	65	90
Derivative liability, fair value	12	14
Not Designated as Hedging Instrument under GAAP \| Customer Contracts
Derivative [Line Items]
Derivative, notional amount	883,848	426,844
Derivative asset, fair value	3,053	3,515
Derivative liability, fair value	6,703	7,286
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	844,087	386,052
Derivative asset, fair value	2,123	1,941
Derivative liability, fair value	5,798	5,724
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	9,335	10,280
Derivative asset, fair value	622	1,208
Derivative liability, fair value	649	1,269
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	30,426	30,512
Derivative asset, fair value	308	366
Derivative liability, fair value	256	293
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	811,705	354,150
Derivative asset, fair value	1,798	1,597
Derivative liability, fair value	5,501	5,397
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	6,084	5,792
Derivative asset, fair value	525	1,003
Derivative liability, fair value	552	1,067
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	72	32
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	3,531	2,799
Derivative asset, fair value	11	10
Derivative liability, fair value	5	6
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	28,779	29,071
Derivative asset, fair value	314	334
Derivative liability, fair value	292	321
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	3,251	4,488
Derivative asset, fair value	97	205
Derivative liability, fair value	97	202
Not Designated as Hedging Instrument under GAAP \| Other Risk Management Activity \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	21,875	12,785
Derivative asset, fair value	34	47
Derivative liability, fair value	$ 199	$ 227

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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