Financial Derivatives (Total Gross Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional /Contract Amount	$ 581,268	$ 515,302
Asset fair value	3,768	5,152
Less: Impact of legally enforceable master netting agreements	1,523	928
Less: Cash collateral received/paid	714	604
Total derivatives	1,531	3,620
Liability fair value	7,618	3,570
Less: Impact of legally enforceable master netting agreements	1,523	928
Less: Cash collateral received/paid	1,571	1,657
Total derivatives	4,524	985
Commodity Contracts
Derivative [Line Items]
Asset fair value	1,208	1,363
Less: Cash collateral received/paid	2	1
Liability fair value	1,269	1,373
Less: Cash collateral received/paid	520	784
Foreign Exchange And Other Contract
Derivative [Line Items]
Asset fair value	437	208
Less: Cash collateral received/paid	82	10
Liability fair value	520	542
Less: Cash collateral received/paid	10	97
Designated as Hedging Instrument
Derivative [Line Items]
Notional /Contract Amount	65,661	73,419
Asset fair value	24	15
Liability fair value	1	38
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	24,231	23,345
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	40,310	48,961
Asset fair value		15
Liability fair value	1	14
Designated as Hedging Instrument \| Net Investment Hedging \| Foreign Exchange Contract
Derivative [Line Items]
Notional /Contract Amount	1,120	1,113
Asset fair value	24
Liability fair value		24
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional /Contract Amount	515,607	441,883
Asset fair value	3,744	5,137
Liability fair value	7,617	3,532
Not Designated as Hedging Instrument \| Mortgage Banking \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	75,978	62,357
Asset fair value	182	101
Liability fair value	104	43
Not Designated as Hedging Instrument \| Mortgage Banking \| Swap \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	47,908	35,623
Asset fair value	7
Liability fair value	1
Not Designated as Hedging Instrument \| Mortgage Banking \| Future \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	5,537	4,592
Not Designated as Hedging Instrument \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	4,516	9,917
Asset fair value	85	55
Liability fair value	89	31
Not Designated as Hedging Instrument \| Mortgage Banking \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	18,017	12,225
Asset fair value	90	46
Liability fair value	14	12
Not Designated as Hedging Instrument \| Customer-related Contracts
Derivative [Line Items]
Notional /Contract Amount	426,844	368,014
Asset fair value	3,515	5,027
Liability fair value	7,286	3,150
Not Designated as Hedging Instrument \| Customer-related Contracts \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	386,052	328,483
Asset fair value	1,941	3,465
Liability fair value	5,724	1,598
Not Designated as Hedging Instrument \| Customer-related Contracts \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	10,280	11,968
Asset fair value	1,208	1,363
Liability fair value	1,269	1,373
Not Designated as Hedging Instrument \| Customer-related Contracts \| Foreign Exchange And Other Contract
Derivative [Line Items]
Notional /Contract Amount	30,512	27,563
Asset fair value	366	199
Liability fair value	293	179
Not Designated as Hedging Instrument \| Customer-related Contracts \| Swap \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	354,150	297,711
Asset fair value	1,597	3,335
Liability fair value	5,397	1,520
Not Designated as Hedging Instrument \| Customer-related Contracts \| Swap \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	5,792	8,840
Asset fair value	1,003	1,150
Liability fair value	1,067	1,161
Not Designated as Hedging Instrument \| Customer-related Contracts \| Future \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	32	907
Not Designated as Hedging Instrument \| Customer-related Contracts \| Mortgage-backed commitments \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	2,799	4,147
Asset fair value	10	5
Liability fair value	6	6
Not Designated as Hedging Instrument \| Customer-related Contracts \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	29,071	25,718
Asset fair value	334	125
Liability fair value	321	72
Not Designated as Hedging Instrument \| Customer-related Contracts \| Other Contract \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	4,488	3,128
Asset fair value	205	213
Liability fair value	202	212
Not Designated as Hedging Instrument \| Other Risk Management Activity \| Foreign Exchange And Other Contract
Derivative [Line Items]
Notional /Contract Amount	12,785	11,512
Asset fair value	47	9
Liability fair value	$ 227	$ 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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