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Investment Securities - Gross Unrealized Losses and Fair Values of Investments in Continuous Unrealized Loss Positions (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
AFS securities, Fair Value    
Less than 12 months, Fair Value $ 18,728 $ 4,043
12 months or more, Fair Value 25,766 27,777
Total, Fair Value 44,494 31,820
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (182) (37)
12 months or more, Unrealized Losses (4,717) (4,613)
Total, Unrealized Losses (4,899) (4,650)
U.S. Treasury    
AFS securities, Fair Value    
Less than 12 months, Fair Value 3,932 704
12 months or more, Fair Value 130 432
Total, Fair Value 4,062 1,136
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (44) (16)
12 months or more, Unrealized Losses (6) (8)
Total, Unrealized Losses (50) (24)
GSE    
AFS securities, Fair Value    
Less than 12 months, Fair Value 105 65
12 months or more, Fair Value 204 228
Total, Fair Value 309 293
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (1) (1)
12 months or more, Unrealized Losses (24) (24)
Total, Unrealized Losses (25) (25)
Agency MBS – residential    
AFS securities, Fair Value    
Less than 12 months, Fair Value 13,928 2,882
12 months or more, Fair Value 23,431 24,986
Total, Fair Value 37,359 27,868
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (117) (8)
12 months or more, Unrealized Losses (4,100) (4,009)
Total, Unrealized Losses (4,217) (4,017)
Debt Securities, Held-to-Maturity, Fair Value    
Less than 12 months, Fair Value 201 0
12 months or more, Fair Value 37,355 39,130
Total, Fair Value 37,556 39,130
Debt Securities, Held-To-Maturity, Unrealized Losses    
Less than 12 months, Unrealized Losses 0 0
12 months or more, Fair Value (8,208) (8,056)
Total, Fair Value (8,208) (8,056)
Agency MBS – commercial    
AFS securities, Fair Value    
Less than 12 months, Fair Value 561 227
12 months or more, Fair Value 1,997 2,093
Total, Fair Value 2,558 2,320
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (8) (2)
12 months or more, Unrealized Losses (587) (572)
Total, Unrealized Losses (595) (574)
States and political subdivisions    
AFS securities, Fair Value    
Less than 12 months, Fair Value 202 158
12 months or more, Fair Value 0 31
Total, Fair Value 202 189
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses (12) (10)
12 months or more, Unrealized Losses 0 0
Total, Unrealized Losses (12) (10)
Other    
AFS securities, Fair Value    
Less than 12 months, Fair Value 0 7
12 months or more, Fair Value 4 7
Total, Fair Value 4 14
AFS securities, Unrealized Losses    
Less than 12 months, Unrealized Losses 0 0
12 months or more, Unrealized Losses 0 0
Total, Unrealized Losses $ 0 $ 0