Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, notional amount	$ 616,995	$ 581,268
Derivative asset, fair value	3,153	3,768
Derivative liability, fair value	6,116	7,618
Derivative asset, fair value offset amount	1,518	1,523
Derivative liability, fair value offset amount	1,518	1,523
Derivative asset, cash collateral	634	714
Derivative liability, cash collateral	911	1,571
Derivative asset, net fair value	1,001	1,531
Derivative liability, net fair value	3,687	4,524
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	769	1,208
Derivative liability, fair value	814	1,269
Derivative asset, cash collateral	99	2
Derivative liability, cash collateral	41	520
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	404	437
Derivative liability, fair value	480	520
Derivative asset, cash collateral	90	82
Derivative liability, cash collateral	9	10
Designated as Hedging Instruments under GAAP
Derivative [Line Items]
Derivative, notional amount	69,110	65,661
Derivative asset, fair value	6	24
Derivative liability, fair value		1
Designated as Hedging Instruments under GAAP \| Fair value hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	26,265	24,231
Designated as Hedging Instruments under GAAP \| Cash flow hedges \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	41,732	40,310
Derivative asset, fair value	1
Derivative liability, fair value		1
Designated as Hedging Instruments under GAAP \| Net investment hedges \| Foreign exchange contracts:
Derivative [Line Items]
Derivative, notional amount	1,113	1,120
Derivative asset, fair value	5	24
Derivative liability, fair value
Not Designated as Hedging Instrument under GAAP
Derivative [Line Items]
Derivative, notional amount	547,885	515,607
Derivative asset, fair value	3,147	3,744
Derivative liability, fair value	6,116	7,617
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	80,807	75,978
Derivative asset, fair value	174	182
Derivative liability, fair value	88	104
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	50,185	47,908
Derivative asset, fair value	5	7
Derivative liability, fair value	4	1
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	6,682	5,537
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	6,555	4,516
Derivative asset, fair value	88	85
Derivative liability, fair value	66	89
Not Designated as Hedging Instrument under GAAP \| Mortgage Banking \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	17,385	18,017
Derivative asset, fair value	81	90
Derivative liability, fair value	18	14
Not Designated as Hedging Instrument under GAAP \| Customer Contracts
Derivative [Line Items]
Derivative, notional amount	453,240	426,844
Derivative asset, fair value	2,932	3,515
Derivative liability, fair value	5,868	7,286
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	411,532	386,052
Derivative asset, fair value	1,805	1,941
Derivative liability, fair value	4,734	5,724
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	9,523	10,280
Derivative asset, fair value	769	1,208
Derivative liability, fair value	814	1,269
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	32,185	30,512
Derivative asset, fair value	358	366
Derivative liability, fair value	320	293
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	375,996	354,150
Derivative asset, fair value	1,515	1,597
Derivative liability, fair value	4,447	5,397
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Swaps \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	5,879	5,792
Derivative asset, fair value	599	1,003
Derivative liability, fair value	645	1,067
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Futures \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	43	32
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Mortgage-backed commitments \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	4,184	2,799
Derivative asset, fair value	8	10
Derivative liability, fair value	18	6
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Interest Rate Contracts
Derivative [Line Items]
Derivative, notional amount	31,309	29,071
Derivative asset, fair value	282	334
Derivative liability, fair value	269	321
Not Designated as Hedging Instrument under GAAP \| Customer Contracts \| Other \| Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	3,644	4,488
Derivative asset, fair value	170	205
Derivative liability, fair value	169	202
Not Designated as Hedging Instrument under GAAP \| Other Risk Management Activity \| Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	13,838	12,785
Derivative asset, fair value	41	47
Derivative liability, fair value	$ 160	$ 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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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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