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Investments in Debt and Equity Securities - Schedule of Cost Basis and Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | $ 3,469 | $ 4,114
Unrealized Pretax Net Gains (Losses) | 1 | (72)
Fair Value | 3,470 | 4,042
U.S. treasury bonds |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 10 | 10
Unrealized Pretax Net Gains (Losses) | 0 | 0
Fair Value | 10 | 10
Other U.S. and non-U.S. government bonds |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 72 | 71
Unrealized Pretax Net Gains (Losses) | 2 | (3)
Fair Value | 74 | 68
Corporate bonds and other debt securities |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 2,475 | 3,199
Unrealized Pretax Net Gains (Losses) | 17 | (29)
Fair Value | 2,492 | 3,170
Asset-backed securities |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 265 | 220
Unrealized Pretax Net Gains (Losses) | 0 | (1)
Fair Value | 265 | 219
U.S. governmental agency |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 515 | 476
Unrealized Pretax Net Gains (Losses) | (15) | (33)
Fair Value | 500 | 443
Residential |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 5 | 2
Unrealized Pretax Net Gains (Losses) | 0 | 0
Fair Value | 5 | 2
Commercial |  |
Schedule of Investments in Debt and Equity Securities |  |
Cost Basis | 127 | 136
Unrealized Pretax Net Gains (Losses) | (3) | (6)
Fair Value | $ 124 | $ 130

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