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Investment Securities - Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued interest available-for-sale debt securities | $ 11 | $ 5
Debt securities |  |
Cost | 2,184 |
Estimated Fair Value | 2,168 | 2,120
Equity securities |  |
Cost | 59 | 60
Gross Unrealized Gains | 17 | 16
Gross Unrealized Losses | (12) | (10)
Estimated Fair Value | 64 | 66
Total Cost | 2,243 | 2,198
Total Gross Unrealized Gains | 17 | 17
Total Gross Unrealized Losses | (28) | (29)
Total Estimated Fair Value | 2,232 | 2,186
State and municipal obligations |  |
Debt securities |  |
Cost | 60 | 61
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7) | (6)
Estimated Fair Value | 53 | 55
U.S. Government agency obligations |  |
Debt securities |  |
Cost | 4 | 4
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4 | 4
U.S. Government treasury obligations |  |
Debt securities |  |
Cost | 1,219 | 1,217
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (8) | (12)
Estimated Fair Value | 1,211 | 1,206
Mortgage-backed securities |  |
Debt securities |  |
Cost | 12 | 12
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 11 | 11
Foreign government bonds and obligations |  |
Debt securities |  |
Cost | 815 | 770
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 815 | 770
Other |  |
Debt securities |  |
Cost | 74 | 74
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 74 | $ 74

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