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Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months $ (19) $ (147)
Unrealized loss position less than 12 months 7,584 24,489
Unrealized loss position 12 months or more (2,632) (3,534)
Unrealized loss position 12 months or more 30,863 25,149
Total (2,651) (3,681)
Total 38,447 49,638
U.S. Treasury and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months (10) (70)
Unrealized loss position less than 12 months 6,439 17,500
Unrealized loss position 12 months or more (375) (366)
Unrealized loss position 12 months or more 9,343 1,824
Total (385) (436)
Total 15,782 19,324
Residential mortgage-backed | Mortgage-backed Securities Agency    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months (5) (65)
Unrealized loss position less than 12 months 1,077 6,163
Unrealized loss position 12 months or more (2,126) (2,926)
Unrealized loss position 12 months or more 18,266 19,595
Total (2,131) (2,991)
Total 19,343 25,758
Residential mortgage-backed | Mortgage-backed Securities Non-agency    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months 0 0
Unrealized loss position less than 12 months 0 0
Unrealized loss position 12 months or more (2) (3)
Unrealized loss position 12 months or more 31 41
Total (2) (3)
Total 31 41
Commercial mortgage servicing rights | Mortgage-backed Securities Agency    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months 0 (8)
Unrealized loss position less than 12 months 0 501
Unrealized loss position 12 months or more (75) (125)
Unrealized loss position 12 months or more 1,552 1,388
Total (75) (133)
Total 1,552 1,889
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months 0 0
Unrealized loss position less than 12 months 0 0
Unrealized loss position 12 months or more (4) (15)
Unrealized loss position 12 months or more 206 559
Total (4) (15)
Total 206 559
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months 0 (2)
Unrealized loss position less than 12 months 0 226
Unrealized loss position 12 months or more 0 (1)
Unrealized loss position 12 months or more 0 8
Total 0 (3)
Total 0 234
Other    
Debt Securities, Available-for-sale [Line Items]    
Unrealized loss position less than 12 months (4) (2)
Unrealized loss position less than 12 months 68 99
Unrealized loss position 12 months or more (50) (98)
Unrealized loss position 12 months or more 1,465 1,734
Total (54) (100)
Total $ 1,533 $ 1,833