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Investment Securities - Gross Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 1,134 | 1,154
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (16) | (19)
State and municipal obligations |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 30 | 33
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (7) | (6)
U.S. Government treasury obligations |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 1,095 | 1,114
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (8) | (12)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 9 | 7
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | $ (1) | $ (1)

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