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Investment Securities - Summary (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Available-for-sale debt securities: |  |
Cost | $ 1,203 |
Estimated Fair Value | 1,192 | $ 2,120
Equity securities |  |
Cost | 53 | 60
Gross Unrealized Gains | 4 | 16
Gross Unrealized Losses | (9) | (10)
Estimated Fair Value | 48 | 66
Total Cost | 1,256 | 2,198
Total Gross Unrealized Gains | 5 | 17
Total Gross Unrealized Losses | (21) | (29)
Total Estimated Fair Value | 1,240 | 2,186
New public companies |  |
Equity securities |  |
Cost | 3 |
Estimated Fair Value | 7 |
State and municipal obligations |  |
Available-for-sale debt securities: |  |
Cost | 57 | 61
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (9) | (6)
Estimated Fair Value | 49 | 55
U.S. Government agency obligations |  |
Available-for-sale 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 |  |
Available-for-sale debt securities: |  |
Cost | 289 | 1,217
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | (12)
Estimated Fair Value | 287 | 1,206
Mortgage-backed securities |  |
Available-for-sale debt securities: |  |
Cost | 11 | 12
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 10 | 11
Foreign government bonds and obligations |  |
Available-for-sale debt securities: |  |
Cost | 765 | 770
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 765 | 770
Other |  |
Available-for-sale debt securities: |  |
Cost | 77 | 74
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 77 | $ 74

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