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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Assets    
Investment securities – available-for-sale $ 68,297 $ 62,039
Mortgage servicing rights 3,627 3,711
Financial derivatives 1,037 816
Liabilities    
Interest-bearing deposit, fair value 7,300 0
Financial derivatives 1,732 3,168
Other liabilities $ 100 $ 100
Assets At Fair Value | Assets, Total | Assets    
Liabilities    
Concentration risk, percentage 15.00% 14.00%
Level 3 Assets | Assets, Total | Assets    
Liabilities    
Concentration risk, percentage 9.00% 10.00%
Level 3 Assets | Assets | Assets    
Liabilities    
Concentration risk, percentage 1.00% 1.00%
Liabilities At Fair Value | Liabilities, Total | Liability    
Liabilities    
Concentration risk, percentage 3.00% 1.00%
Level Three Liabilities | Liabilities, Total | Liability    
Liabilities    
Concentration risk, percentage 2.00% 5.00%
Level Three Liabilities | Liability | Liability    
Liabilities    
Concentration risk, percentage 1.00% 1.00%
Fair Value, Recurring    
Assets    
Investment securities – available-for-sale $ 68,297 $ 62,039
Loans 1,117 1,156
Equity investments 3,177 3,132
Trading securities 6,091 2,774
Financial derivatives 2,829 3,011
Other assets 704 592
Total Assets 86,789 77,246
Liabilities    
Interest-bearing deposit, fair value 7,318 0
Other borrowed funds 2,377 1,299
Financial derivatives 3,791 5,495
Other liabilities 178 205
Total liabilities 13,664 6,999
Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 26,700 22,534
Loans 0 0
Equity investments 715 825
Trading securities 2,829 987
Financial derivatives 9 3
Other assets 497 449
Total Assets 30,750 24,798
Liabilities    
Interest-bearing deposit, fair value 0 0
Other borrowed funds 2,163 1,161
Financial derivatives 4 11
Other liabilities 0 0
Total liabilities 2,167 1,172
Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 40,816 38,652
Loans 477 486
Equity investments 0 0
Trading securities 3,262 1,787
Financial derivatives 2,811 3,004
Other assets 193 133
Total Assets 48,384 44,821
Liabilities    
Interest-bearing deposit, fair value 7,318 0
Other borrowed funds 204 128
Financial derivatives 3,679 5,334
Other liabilities 28 28
Total liabilities 11,229 5,490
Level 3    
Assets    
Equity investments 2,237 2,111
Liabilities    
Financial derivatives 103 143
Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 781 853
Loans 640 670
Equity investments 2,237 2,111
Trading securities 0 0
Financial derivatives 9 4
Other assets 14 10
Total Assets 7,430 7,431
Liabilities    
Interest-bearing deposit, fair value 0 0
Other borrowed funds 10 10
Financial derivatives 108 150
Other liabilities 150 177
Total liabilities 268 337
Residential mortgage loans held for sale | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 692 628
Residential mortgage loans held for sale | Level 1 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 0 0
Residential mortgage loans held for sale | Level 2 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 570 560
Residential mortgage loans held for sale | Level 3 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 122 68
Commercial mortgage loans held for sale | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 255 203
Commercial mortgage loans held for sale | Level 1 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 0 0
Commercial mortgage loans held for sale | Level 2 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 255 199
Commercial mortgage loans held for sale | Level 3 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 0 4
U.S. Treasury and government agencies | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 27,699 23,551
U.S. Treasury and government agencies | Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 26,700 22,534
U.S. Treasury and government agencies | Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 999 1,017
U.S. Treasury and government agencies | Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Residential mortgage-backed | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 31,787 30,626
Residential mortgage-backed | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 560 603
Residential mortgage-backed | Level 1 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Residential mortgage-backed | Level 1 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 31,787 30,626
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Residential mortgage-backed | Level 3 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Residential mortgage-backed | Level 3 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 560 603
Commercial mortgage servicing rights | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 3,380 1,945
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 290 691
Commercial mortgage servicing rights | Level 1 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Commercial mortgage servicing rights | Level 1 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Commercial mortgage servicing rights | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 3,380 1,945
Commercial mortgage servicing rights | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 211 588
Commercial mortgage servicing rights | Level 3 | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Commercial mortgage servicing rights | Level 3 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 79 103
Asset-backed | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,443 2,392
Asset-backed | Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Asset-backed | Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,355 2,299
Asset-backed | Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 88 93
Other | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,138 2,231
Other | Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 0 0
Other | Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,084 2,177
Other | Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 54 54
Residential mortgage servicing rights | Fair Value, Recurring    
Assets    
Mortgage servicing rights 2,622 2,626
Residential mortgage servicing rights | Level 1 | Fair Value, Recurring    
Assets    
Mortgage servicing rights 0 0
Residential mortgage servicing rights | Level 2 | Fair Value, Recurring    
Assets    
Mortgage servicing rights 0 0
Residential mortgage servicing rights | Level 3 | Fair Value, Recurring    
Assets    
Mortgage servicing rights 2,622 2,626
Commercial mortgage servicing rights | Fair Value, Recurring    
Assets    
Mortgage servicing rights 1,005 1,085
Commercial mortgage servicing rights | Level 1 | Fair Value, Recurring    
Assets    
Mortgage servicing rights 0 0
Commercial mortgage servicing rights | Level 2 | Fair Value, Recurring    
Assets    
Mortgage servicing rights 0 0
Commercial mortgage servicing rights | Level 3 | Fair Value, Recurring    
Assets    
Mortgage servicing rights $ 1,005 $ 1,085