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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Assets    
Investment securities – available-for-sale $ 63,318 $ 62,039
Mortgage servicing rights 3,564 3,711
Financial derivatives 1,112 816
Liabilities    
Interest-bearing deposit, fair value 1,200 0
Financial derivatives 2,375 3,168
Other liabilities $ 100 $ 100
Assets At Fair Value | Assets, Total | Assets    
Liabilities    
Concentration risk, percentage 14.00% 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 2.00% 1.00%
Level Three Liabilities | Liabilities, Total | Liability    
Liabilities    
Concentration risk, percentage 4.00% 5.00%
Level Three Liabilities | Liability | Liability    
Liabilities    
Concentration risk, percentage 1.00% 1.00%
Fair Value, Recurring    
Assets    
Investment securities – available-for-sale $ 63,318 $ 62,039
Loans 1,149 1,156
Equity investments 2,995 3,132
Trading securities 4,273 2,774
Financial derivatives 3,074 3,011
Other assets 585 592
Total Assets 79,965 77,246
Liabilities    
Interest-bearing deposit, fair value 1,160 0
Other borrowed funds 1,779 1,299
Financial derivatives 4,730 5,495
Other liabilities 157 205
Total liabilities 7,826 6,999
Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 23,457 22,534
Loans 0 0
Equity investments 569 825
Trading securities 1,759 987
Financial derivatives 15 3
Other assets 442 449
Total Assets 26,242 24,798
Liabilities    
Interest-bearing deposit, fair value 0 0
Other borrowed funds 1,640 1,161
Financial derivatives 17 11
Other liabilities 0 0
Total liabilities 1,657 1,172
Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 39,020 38,652
Loans 486 486
Equity investments 0 0
Trading securities 2,514 1,787
Financial derivatives 3,049 3,004
Other assets 131 133
Total Assets 46,099 44,821
Liabilities    
Interest-bearing deposit, fair value 1,160 0
Other borrowed funds 126 128
Financial derivatives 4,552 5,334
Other liabilities 28 28
Total liabilities 5,866 5,490
Level 3    
Assets    
Equity investments 2,223 2,111
Liabilities    
Financial derivatives 157 143
Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 841 853
Loans 663 670
Equity investments 2,223 2,111
Trading securities 0 0
Financial derivatives 10 4
Other assets 12 10
Total Assets 7,421 7,431
Liabilities    
Interest-bearing deposit, fair value 0 0
Other borrowed funds 13 10
Financial derivatives 161 150
Other liabilities 129 177
Total liabilities 303 337
Residential mortgage loans held for sale | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 542 628
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 438 560
Residential mortgage loans held for sale | Level 3 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 104 68
Commercial mortgage loans held for sale | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 465 203
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 461 199
Commercial mortgage loans held for sale | Level 3 | Fair Value, Recurring    
Assets    
Commercial mortgage loans held for sale 4 4
U.S. Treasury and government agencies | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 24,504 23,551
U.S. Treasury and government agencies | Level 1 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 23,457 22,534
U.S. Treasury and government agencies | Level 2 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 1,047 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 30,714 30,626
Residential mortgage-backed | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 596 603
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 30,714 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 596 603
Commercial mortgage servicing rights | Mortgage-backed Securities Agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,453 1,945
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 603 691
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 2,453 1,945
Commercial mortgage servicing rights | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 504 588
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 99 103
Asset-backed | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,330 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 2,238 2,299
Asset-backed | Level 3 | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 92 93
Other | Fair Value, Recurring    
Assets    
Investment securities – available-for-sale 2,118 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 2,064 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 2,523 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 2,523 2,626
Commercial mortgage servicing rights | Fair Value, Recurring    
Assets    
Mortgage servicing rights 1,041 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 $ 1,041 $ 1,085