Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional /Contract Amount	$ 515,302	$ 466,707
Asset fair value	5,152	6,533
Less: Impact of legally enforceable master netting agreements	928	720
Less: Cash collateral received/paid	604	1,434
Total derivatives	3,620	4,379
Liability fair value	3,570	2,756
Less: Impact of legally enforceable master netting agreements	928	720
Less: Cash collateral received/paid	1,657	1,452
Total derivatives	985	584
Commodity Contracts
Derivative [Line Items]
Asset fair value	1,363	411
Less: Cash collateral received/paid	1	4
Liability fair value	1,373	384
Less: Cash collateral received/paid	784	103
Foreign Exchange And Other Contract
Derivative [Line Items]
Asset fair value	208	271
Less: Cash collateral received/paid	10	4
Liability fair value	542	590
Less: Cash collateral received/paid	97	170
Designated as Hedging Instrument
Derivative [Line Items]
Notional /Contract Amount	73,419	48,103
Asset fair value	15	14
Liability fair value	38	22
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	23,345	24,153
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	48,961	22,875
Asset fair value	15	14
Liability fair value	14
Designated as Hedging Instrument \| Net Investment Hedging \| Foreign Exchange Contract
Derivative [Line Items]
Notional /Contract Amount	1,113	1,075
Asset fair value
Liability fair value	24	22
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional /Contract Amount	441,883	418,604
Asset fair value	5,137	6,519
Liability fair value	3,532	2,734
Not Designated as Hedging Instrument \| Mortgage Banking \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	62,357	66,471
Asset fair value	101	158
Liability fair value	43	79
Not Designated as Hedging Instrument \| Mortgage Banking \| Swap \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	35,623	50,511
Not Designated as Hedging Instrument \| Mortgage Banking \| Future \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	4,592	2,841
Not Designated as Hedging Instrument \| Mortgage Banking \| Mortgage-backed commitments \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	9,917	11,288
Asset fair value	55	147
Liability fair value	31	77
Not Designated as Hedging Instrument \| Mortgage Banking \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	12,225	1,831
Asset fair value	46	11
Liability fair value	12	2
Not Designated as Hedging Instrument \| Customer-related Contracts
Derivative [Line Items]
Notional /Contract Amount	368,014	341,202
Asset fair value	5,027	6,357
Liability fair value	3,150	2,330
Not Designated as Hedging Instrument \| Customer-related Contracts \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	328,483	305,663
Asset fair value	3,465	5,679
Liability fair value	1,598	1,703
Not Designated as Hedging Instrument \| Customer-related Contracts \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	11,968	8,919
Asset fair value	1,363	411
Liability fair value	1,373	384
Not Designated as Hedging Instrument \| Customer-related Contracts \| Foreign Exchange And Other Contract
Derivative [Line Items]
Notional /Contract Amount	27,563	26,620
Asset fair value	199	267
Liability fair value	179	243
Not Designated as Hedging Instrument \| Customer-related Contracts \| Swap \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	297,711	280,125
Asset fair value	3,335	5,475
Liability fair value	1,520	1,601
Not Designated as Hedging Instrument \| Customer-related Contracts \| Swap \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	8,840	6,149
Asset fair value	1,150	350
Liability fair value	1,161	323
Not Designated as Hedging Instrument \| Customer-related Contracts \| Future \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	907	1,235
Not Designated as Hedging Instrument \| Customer-related Contracts \| Mortgage-backed commitments \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	4,147	4,178
Asset fair value	5	11
Liability fair value	6	14
Not Designated as Hedging Instrument \| Customer-related Contracts \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Notional /Contract Amount	25,718	20,125
Asset fair value	125	193
Liability fair value	72	88
Not Designated as Hedging Instrument \| Customer-related Contracts \| Other Contract \| Commodity Contracts
Derivative [Line Items]
Notional /Contract Amount	3,128	2,770
Asset fair value	213	61
Liability fair value	212	61
Not Designated as Hedging Instrument \| Other Risk Management Activity \| Foreign Exchange And Other Contract
Derivative [Line Items]
Notional /Contract Amount	11,512	10,931
Asset fair value	9	4
Liability fair value	$ 339	$ 325

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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