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Investments in Debt and Equity Securities - Summary of Investments In An Unrealized Loss Position That Are Not Other-Than-Temporarily Impaired (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | $ 377 | $ 875
Less than 12 months - Unrealized losses | 2 | 6
12 months or more - Fair Value | 1,104 | 1,290
12 months or more - Unrealized losses | 53 | 75
Fair Value | 1,481 | 2,165
Unrealized Losses | 55 | 81
Other U.S. and non-U.S. government bonds |  |
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | 0 | 0
Less than 12 months - Unrealized losses | 0 | 0
12 months or more - Fair Value | 35 | 55
12 months or more - Unrealized losses | 2 | 4
Fair Value | 35 | 55
Unrealized Losses | 2 | 4
Corporate bonds and other debt securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | 242 | 729
Less than 12 months - Unrealized losses | 1 | 3
12 months or more - Fair Value | 655 | 812
12 months or more - Unrealized losses | 22 | 33
Fair Value | 897 | 1,541
Unrealized Losses | 23 | 36
Asset-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | 63 | 7
Less than 12 months - Unrealized losses | 0 | 0
12 months or more - Fair Value | 47 | 37
12 months or more - Unrealized losses | 1 | 2
Fair Value | 110 | 44
Unrealized Losses | 1 | 2
U.S. governmental agency |  |
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | 67 | 126
Less than 12 months - Unrealized losses | 1 | 3
12 months or more - Fair Value | 265 | 273
12 months or more - Unrealized losses | 24 | 30
Fair Value | 332 | 399
Unrealized Losses | 25 | 33
Commercial |  |
Available-for-sale Securities, Continuous Unrealized Loss Position |  |
Less than 12 months - Fair Value | 5 | 13
Less than 12 months - Unrealized losses | 0 | 0
12 months or more - Fair Value | 102 | 113
12 months or more - Unrealized losses | 4 | 6
Fair Value | 107 | 126
Unrealized Losses | $ 4 | $ 6

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