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Investment Securities - Schedule of Investments within the Available for Sale Portfolio that had Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 1,151 | $ 1,614
12 months or longer | 5,819 | 5,855
Total fair value | 6,970 | 7,469
Unrealized Losses |  |
Less than 12 months | (3) | (18)
12 months or longer | (884) | (1,017)
Total unrealized losses | (887) | (1,035)
Government agency issued MBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 348 | 663
12 months or longer | 2,996 | 2,992
Total fair value | 3,344 | 3,655
Unrealized Losses |  |
Less than 12 months | (1) | (9)
12 months or longer | (435) | (513)
Total unrealized losses | (436) | (522)
Government agency issued CMO |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 656 | 675
12 months or longer | 1,722 | 1,744
Total fair value | 2,378 | 2,419
Unrealized Losses |  |
Less than 12 months | (1) | (2)
12 months or longer | (279) | (310)
Total unrealized losses | (280) | (312)
Other U.S. government agencies |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 71 | 210
12 months or longer | 859 | 863
Total fair value | 930 | 1,073
Unrealized Losses |  |
Less than 12 months | 0 | (6)
12 months or longer | (129) | (155)
Total unrealized losses | (129) | (161)
States and municipalities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 76 | 66
12 months or longer | 242 | 256
Total fair value | 318 | 322
Unrealized Losses |  |
Less than 12 months | (1) | (1)
12 months or longer | (41) | (39)
Total unrealized losses | $ (42) | $ (40)

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