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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
AFS securities:    
Amortized Cost $ 72,325 $ 69,302
Gross Unrealized Gains 225 390
Gross Unrealized Losses (4,899) (4,650)
Net unrealized gains (losses) (4,674) (4,260)
Total AFS securities 67,651 65,042
Portfolio level basis adjustments, excluded from amortized cost (102) 77
Portfolio level basis adjustments, net unrealized gain (loss) 102 (77)
Total AFS securities, amortized cost 72,223 69,379
Total AFS securities, net unrealized gains (losses) (4,572) (4,337)
HTM securities:    
Amortized Cost 46,351 47,186
U.S. Treasury    
AFS securities:    
Amortized Cost 13,316 12,727
Gross Unrealized Gains 47 89
Gross Unrealized Losses (50) (24)
Net unrealized gains (losses) (3) 65
Total AFS securities 13,313 12,792
GSE    
AFS securities:    
Amortized Cost 459 481
Gross Unrealized Gains 2 4
Gross Unrealized Losses (25) (25)
Net unrealized gains (losses) (23) (21)
Total AFS securities 436 460
Agency MBS – residential    
AFS securities:    
Amortized Cost 53,207 51,971
Gross Unrealized Gains 162 272
Gross Unrealized Losses (4,217) (4,017)
Net unrealized gains (losses) (4,055) (3,745)
Total AFS securities 49,152 48,226
HTM securities:    
Amortized Cost 46,351 47,186
Gross Unrealized Gains 2 0
Gross Unrealized Losses (8,208) (8,056)
Net unrealized gains (losses) (8,206) (8,056)
HTM securities, fair value 38,145 39,130
Agency MBS – commercial    
AFS securities:    
Amortized Cost 3,718 3,762
Gross Unrealized Gains 3 12
Gross Unrealized Losses (595) (574)
Net unrealized gains (losses) (592) (562)
Total AFS securities 3,126 3,200
States and political subdivisions    
AFS securities:    
Amortized Cost 342 347
Gross Unrealized Gains 11 13
Gross Unrealized Losses (12) (10)
Net unrealized gains (losses) (1) 3
Total AFS securities 341 350
Collateralized loan obligations    
AFS securities:    
Amortized Cost 1,279  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Net unrealized gains (losses) 0  
Total AFS securities 1,279  
Other    
AFS securities:    
Amortized Cost 4 14
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Net unrealized gains (losses) 0 0
Total AFS securities $ 4 $ 14