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Investments - Unrealized Loss (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 20,691 | $ 27,288
Gross Unrealized Losses | 2,295 | 3,039
Additional impairment losses | 0 |
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 1,367 | 1,800
Gross Unrealized Losses | 248 | 282
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 3,765 | 4,247
Gross Unrealized Losses | 633 | 730
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 5,049 | 6,330
Gross Unrealized Losses | 436 | 582
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 7,846 | 11,548
Gross Unrealized Losses | 627 | 980
U.S. Government, Government agencies and Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 1,959 | 2,567
Gross Unrealized Losses | 281 | 373
Non-investment grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 705 | 796
Gross Unrealized Losses | $ 70 | $ 92

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