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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Assets:      
Available-for-sale debt and other securities: $ 44,466 $ 36,159  
Equity securities 495 453  
Derivative assets 2,478 1,868  
Liabilities:      
Derivative Liabilities 2,666 2,034  
Residential Mortgage      
Assets:      
Residential mortgage loans 102 106 $ 107
U.S. Treasury and federal agencies securities      
Assets:      
Available-for-sale debt and other securities: 1,899 1,575  
Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities: 2,303 2,267  
Other securities      
Assets:      
Available-for-sale debt and other securities: 1,260 674  
Liabilities:      
FHLB, restricted stock holdings 368 167  
FRB, restricted stock holdings 889 505  
DTCC, restricted stock holdings 3 2  
Level 3 | Interest rate contracts      
Assets:      
Derivative assets 7   7
Liabilities:      
Derivative Liabilities 9   $ 5
Recurring      
Assets:      
Available-for-sale debt and other securities: 43,206 35,485  
Trading debt securities 1,853 1,057  
Equity securities 495 453  
Derivative assets 2,478 1,868  
Total assets 50,414 41,225  
Liabilities:      
Derivative Liabilities 2,666 2,034  
Short positions 505 351  
Total liabilities 3,171 2,385  
Recurring | Interest rate contracts      
Assets:      
Derivative assets 619 463  
Liabilities:      
Derivative Liabilities 802 544  
Recurring | Foreign exchange contracts      
Assets:      
Derivative assets 503 659  
Liabilities:      
Derivative Liabilities 437 628  
Recurring | Equity contracts      
Liabilities:      
Derivative Liabilities 70 124  
Recurring | Commodity contracts      
Assets:      
Derivative assets 1,356 746  
Liabilities:      
Derivative Liabilities 1,357 738  
Recurring | Residential mortgage servicing rights      
Assets:      
Residential mortgage servicing rights 1,582 1,598  
Recurring | Residential Mortgage      
Assets:      
Residential mortgage loans held for sale 695 658  
Residential mortgage loans 102 106  
Recurring | Commercial      
Assets:      
Residential mortgage loans held for sale 3 0  
Recurring | U.S. Treasury and federal agencies securities      
Assets:      
Available-for-sale debt and other securities: 1,899 1,575  
Trading debt securities 697 494  
Liabilities:      
Short positions 129 85  
Recurring | Obligations of states and political subdivisions securities      
Assets:      
Trading debt securities 149 63  
Recurring | Agency mortgage-backed securities | Residential Mortgage      
Assets:      
Available-for-sale debt and other securities: 15,029 8,623  
Trading debt securities 42 49  
Recurring | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 21,357 20,187  
Recurring | Non-agency commercial mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 2,618 2,833  
Recurring | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities: 2,303 2,267  
Trading debt securities 965 451  
Liabilities:      
Short positions 316 218  
Recurring | Equity securities      
Liabilities:      
Short positions 60 48  
Recurring | Level 1      
Assets:      
Available-for-sale debt and other securities: 1,899 1,575  
Trading debt securities 659 482  
Equity securities 473 436  
Derivative assets 133 225  
Total assets 3,164 2,718  
Liabilities:      
Derivative Liabilities 133 38  
Short positions 189 130  
Total liabilities 322 168  
Recurring | Level 1 | Interest rate contracts      
Assets:      
Derivative assets 3 1  
Liabilities:      
Derivative Liabilities 3 3  
Recurring | Level 1 | Foreign exchange contracts      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative Liabilities 0 0  
Recurring | Level 1 | Equity contracts      
Liabilities:      
Derivative Liabilities 0 0  
Recurring | Level 1 | Commodity contracts      
Assets:      
Derivative assets 130 224  
Liabilities:      
Derivative Liabilities 130 35  
Recurring | Level 1 | Residential mortgage servicing rights      
Assets:      
Residential mortgage servicing rights 0 0  
Recurring | Level 1 | Residential Mortgage      
Assets:      
Residential mortgage loans held for sale 0 0  
Residential mortgage loans 0 0  
Recurring | Level 1 | Commercial      
Assets:      
Residential mortgage loans held for sale 0 0  
Recurring | Level 1 | U.S. Treasury and federal agencies securities      
Assets:      
Available-for-sale debt and other securities: 1,899 1,575  
Trading debt securities 659 482  
Liabilities:      
Short positions 129 82  
Recurring | Level 1 | Obligations of states and political subdivisions securities      
Assets:      
Trading debt securities 0 0  
Recurring | Level 1 | Agency mortgage-backed securities | Residential Mortgage      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Recurring | Level 1 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 0 0  
Recurring | Level 1 | Non-agency commercial mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 0 0  
Recurring | Level 1 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Recurring | Level 1 | Equity securities      
Liabilities:      
Short positions 60 48  
Recurring | Level 2      
Assets:      
Available-for-sale debt and other securities: 41,307 33,910  
Trading debt securities 1,194 575  
Equity securities 22 17  
Derivative assets 2,338 1,638  
Total assets 45,559 36,798  
Liabilities:      
Derivative Liabilities 2,454 1,868  
Short positions 316 221  
Total liabilities 2,770 2,089  
Recurring | Level 2 | Interest rate contracts      
Assets:      
Derivative assets 609 457  
Liabilities:      
Derivative Liabilities 790 537  
Recurring | Level 2 | Foreign exchange contracts      
Assets:      
Derivative assets 503 659  
Liabilities:      
Derivative Liabilities 437 628  
Recurring | Level 2 | Equity contracts      
Liabilities:      
Derivative Liabilities 0 0  
Recurring | Level 2 | Commodity contracts      
Assets:      
Derivative assets 1,226 522  
Liabilities:      
Derivative Liabilities 1,227 703  
Recurring | Level 2 | Residential mortgage servicing rights      
Assets:      
Residential mortgage servicing rights 0 0  
Recurring | Level 2 | Residential Mortgage      
Assets:      
Residential mortgage loans held for sale 695 658  
Residential mortgage loans 0 0  
Recurring | Level 2 | Commercial      
Assets:      
Residential mortgage loans held for sale 3 0  
Recurring | Level 2 | U.S. Treasury and federal agencies securities      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 38 12  
Liabilities:      
Short positions 0 3  
Recurring | Level 2 | Obligations of states and political subdivisions securities      
Assets:      
Trading debt securities 149 63  
Recurring | Level 2 | Agency mortgage-backed securities | Residential Mortgage      
Assets:      
Available-for-sale debt and other securities: 15,029 8,623  
Trading debt securities 42 49  
Recurring | Level 2 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 21,357 20,187  
Recurring | Level 2 | Non-agency commercial mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 2,618 2,833  
Recurring | Level 2 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities: 2,303 2,267  
Trading debt securities 965 451  
Liabilities:      
Short positions 316 218  
Recurring | Level 2 | Equity securities      
Liabilities:      
Short positions 0 0  
Recurring | Level 3      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Equity securities 0 0  
Derivative assets 7 5  
Total assets 1,691 1,709  
Liabilities:      
Derivative Liabilities 79 128  
Short positions 0 0  
Total liabilities 79 128  
Recurring | Level 3 | Interest rate contracts      
Assets:      
Derivative assets 7 5  
Liabilities:      
Derivative Liabilities 9 4  
Recurring | Level 3 | Foreign exchange contracts      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative Liabilities 0 0  
Recurring | Level 3 | Equity contracts      
Liabilities:      
Derivative Liabilities 70 124  
Recurring | Level 3 | Commodity contracts      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative Liabilities 0 0  
Recurring | Level 3 | Residential mortgage servicing rights      
Assets:      
Residential mortgage servicing rights 1,582 1,598  
Recurring | Level 3 | Residential Mortgage      
Assets:      
Residential mortgage loans held for sale 0 0  
Residential mortgage loans 102 106  
Recurring | Level 3 | Commercial      
Assets:      
Residential mortgage loans held for sale 0 0  
Recurring | Level 3 | U.S. Treasury and federal agencies securities      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Recurring | Level 3 | Obligations of states and political subdivisions securities      
Assets:      
Trading debt securities 0 0  
Recurring | Level 3 | Agency mortgage-backed securities | Residential Mortgage      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Recurring | Level 3 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 0 0  
Recurring | Level 3 | Non-agency commercial mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities: 0 0  
Recurring | Level 3 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities: 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Recurring | Level 3 | Equity securities      
Liabilities:      
Short positions $ 0 $ 0