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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

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