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Investment Securities - Gross Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 145 | 152
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (9) | (12)
State and municipal obligations |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 22 | 22
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (8) | (9)
U.S. Government treasury obligations |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 123 | 123
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (1) | (2)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 0 | 7
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | $ 0 | $ (1)

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