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Financial Derivatives (Total Derivatives) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative, notional amount $ 716,509 $ 656,051
Derivative asset, fair value 3,308 3,429
Derivative liability, fair value 4,627 5,899
Derivative asset, fair value offset amount 1,431 1,406
Derivative liability, fair value offset amount 1,431 1,406
Less: Cash collateral received/paid, derivative asset fair value 761 1,126
Less: Cash collateral received/paid, derivative liability fair value 836 955
Derivative assets, Net Fair Value 1,116 897
Derivative liabilities, Net Fair Value 2,360 3,538
Commodity contracts:    
Derivative [Line Items]    
Derivative asset, fair value 622 765
Derivative liability, fair value 598 757
Less: Cash collateral received/paid, derivative asset fair value 137 283
Less: Cash collateral received/paid, derivative liability fair value 8  
Derivative assets, Net Fair Value 115 166
Derivative liabilities, Net Fair Value 245 425
Foreign exchange contracts and other    
Derivative [Line Items]    
Derivative asset, fair value 336 307
Derivative liability, fair value 668 494
Less: Cash collateral received/paid, derivative asset fair value 25 76
Less: Cash collateral received/paid, derivative liability fair value 43 13
Derivative assets, Net Fair Value 194 117
Derivative liabilities, Net Fair Value 410 292
Designated as Hedging Instruments under GAAP    
Derivative [Line Items]    
Derivative, notional amount 129,143 91,555
Derivative asset, fair value 350 327
Derivative liability, fair value 150 139
Designated as Hedging Instruments under GAAP | Fair value hedges | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 54,084 32,079
Designated as Hedging Instruments under GAAP | Cash flow hedges | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 48,847 33,302
Derivative asset, fair value  
Derivative liability, fair value
Designated as Hedging Instruments under GAAP | Cash flow hedges | Other | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 25,000 25,000
Derivative asset, fair value 349 327
Derivative liability, fair value 88 137
Designated as Hedging Instruments under GAAP | Net investment hedges | Foreign Exchange Contract    
Derivative [Line Items]    
Derivative, notional amount 1,212 1,174
Derivative asset, fair value 1
Derivative liability, fair value 62 2
Not Designated as Hedging Instrument under GAAP    
Derivative [Line Items]    
Derivative, notional amount 587,366 564,496
Derivative asset, fair value 2,958 3,102
Derivative liability, fair value 4,477 5,760
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 75,143 72,457
Derivative asset, fair value 106 112
Derivative liability, fair value 70 89
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Swaps | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 49,343 43,450
Derivative asset, fair value
Derivative liability, fair value
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Futures | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 9,863 10,370
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Mortgage-backed commitments | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 4,879 3,093
Derivative asset, fair value 67 66
Derivative liability, fair value 60 67
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Other | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 11,058 15,544
Derivative asset, fair value 39 46
Derivative liability, fair value 10 22
Not Designated as Hedging Instrument under GAAP | Customer Contracts    
Derivative [Line Items]    
Derivative, notional amount 500,655 477,157
Derivative asset, fair value 2,832 2,978
Derivative liability, fair value 4,058 5,418
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 446,622 432,761
Derivative asset, fair value 1,895 1,918
Derivative liability, fair value 3,203 4,422
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Commodity contracts:    
Derivative [Line Items]    
Derivative, notional amount 15,661 11,511
Derivative asset, fair value 622 765
Derivative liability, fair value 598 757
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Foreign exchange contracts and other    
Derivative [Line Items]    
Derivative, notional amount 38,372 32,885
Derivative asset, fair value 315 295
Derivative liability, fair value 257 239
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 409,026 401,607
Derivative asset, fair value 1,769 1,723
Derivative liability, fair value 3,094 4,228
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Commodity contracts:    
Derivative [Line Items]    
Derivative, notional amount 6,308 6,714
Derivative asset, fair value 383 577
Derivative liability, fair value 360 569
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Futures | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 133 73
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Mortgage-backed commitments | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 6,543 2,592
Derivative asset, fair value 8 9
Derivative liability, fair value 9 25
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Interest rate contracts    
Derivative [Line Items]    
Derivative, notional amount 30,920 28,489
Derivative asset, fair value 118 186
Derivative liability, fair value 100 169
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Commodity contracts:    
Derivative [Line Items]    
Derivative, notional amount 9,353 4,797
Derivative asset, fair value 239 188
Derivative liability, fair value 238 188
Not Designated as Hedging Instrument under GAAP | Other Risk Management Activity | Foreign exchange contracts and other    
Derivative [Line Items]    
Derivative, notional amount 11,568 14,882
Derivative asset, fair value 20 12
Derivative liability, fair value $ 349 $ 253