Financial Derivatives (Total Gross Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative, notional amount	$ 701,952	$ 656,051
Derivative asset, fair value	3,011	3,429
Derivative liability, fair value	5,495	5,899
Derivative asset, fair value offset amount	1,298	1,406
Derivative liability, fair value offset amount	1,298	1,406
Derivative asset, cash collateral	897	1,126
Derivative liability, cash collateral	1,029	955
Derivative Asset, Net	816	897
Derivative Liability, Net	3,168	3,538
Commodity contracts:
Derivative [Line Items]
Derivative asset, fair value	521	765
Derivative liability, fair value	496	757
Derivative asset, cash collateral	85	283
Derivative liability, cash collateral	2
Derivative Asset, Net	140	166
Derivative Liability, Net	101	425
Foreign exchange contracts and other
Derivative [Line Items]
Derivative asset, fair value	561	307
Derivative liability, fair value	513	494
Derivative asset, cash collateral	183	76
Derivative liability, cash collateral	8	13
Derivative Asset, Net	219	117
Derivative Liability, Net	332	292
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	130,740	91,555
Derivative asset, fair value	163	327
Derivative liability, fair value	170	139
Designated as Hedging Instrument | Fair Value Hedging | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	53,750	32,079
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	50,721	33,302
Derivative asset, fair value
Derivative liability, fair value	2
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Floor And Cap
Derivative [Line Items]
Derivative, notional amount	25,000	25,000
Derivative asset, fair value	149	327
Derivative liability, fair value	168	137
Designated as Hedging Instrument | Net Investment Hedging | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	1,269	1,174
Derivative asset, fair value	14
Derivative liability, fair value		2
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	571,212	564,496
Derivative asset, fair value	2,848	3,102
Derivative liability, fair value	5,325	5,760
Not Designated as Hedging Instrument | Mortgage Banking | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	63,816	72,457
Derivative asset, fair value	92	112
Derivative liability, fair value	79	89
Not Designated as Hedging Instrument | Mortgage Banking | Swap | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	35,941	43,450
Derivative asset, fair value
Derivative liability, fair value
Not Designated as Hedging Instrument | Mortgage Banking | Future | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	9,962	10,370
Not Designated as Hedging Instrument | Mortgage Banking | Mortgage-backed commitments | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	4,815	3,093
Derivative asset, fair value	73	66
Derivative liability, fair value	66	67
Not Designated as Hedging Instrument | Mortgage Banking | Other Contract | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	13,098	15,544
Derivative asset, fair value	19	46
Derivative liability, fair value	13	22
Not Designated as Hedging Instrument | Customer-related Contracts
Derivative [Line Items]
Derivative, notional amount	496,365	477,157
Derivative asset, fair value	2,612	2,978
Derivative liability, fair value	5,097	5,418
Not Designated as Hedging Instrument | Customer-related Contracts | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	442,415	432,761
Derivative asset, fair value	1,688	1,918
Derivative liability, fair value	4,237	4,422
Not Designated as Hedging Instrument | Customer-related Contracts | Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	15,221	11,511
Derivative asset, fair value	521	765
Derivative liability, fair value	496	757
Not Designated as Hedging Instrument | Customer-related Contracts | Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	38,729	32,885
Derivative asset, fair value	403	295
Derivative liability, fair value	364	239
Not Designated as Hedging Instrument | Customer-related Contracts | Swap | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	406,747	401,607
Derivative asset, fair value	1,544	1,723
Derivative liability, fair value	4,130	4,228
Not Designated as Hedging Instrument | Customer-related Contracts | Swap | Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	6,725	6,714
Derivative asset, fair value	313	577
Derivative liability, fair value	288	569
Not Designated as Hedging Instrument | Customer-related Contracts | Future | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	113	73
Not Designated as Hedging Instrument | Customer-related Contracts | Mortgage-backed commitments | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	3,275	2,592
Derivative asset, fair value	21	9
Derivative liability, fair value	7	25
Not Designated as Hedging Instrument | Customer-related Contracts | Other Contract | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	32,280	28,489
Derivative asset, fair value	123	186
Derivative liability, fair value	100	169
Not Designated as Hedging Instrument | Customer-related Contracts | Other Contract | Commodity contracts:
Derivative [Line Items]
Derivative, notional amount	8,496	4,797
Derivative asset, fair value	208	188
Derivative liability, fair value	208	188
Not Designated as Hedging Instrument | Other Risk Management Activity | Foreign exchange contracts and other
Derivative [Line Items]
Derivative, notional amount	11,031	14,882
Derivative asset, fair value	144	12
Derivative liability, fair value	$ 149	$ 253