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Investments - Unrealized Loss (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 22,400 | $ 25,731
Gross Unrealized Losses | 2,236 | 2,995
Additional impairment losses | 0 |
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 1,277 | 1,524
Gross Unrealized Losses | 221 | 261
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 3,641 | 3,817
Gross Unrealized Losses | 547 | 658
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 5,229 | 5,652
Gross Unrealized Losses | 405 | 517
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 9,243 | 11,523
Gross Unrealized Losses | 689 | 1,095
U.S. Government, Government agencies and Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 2,127 | 2,273
Gross Unrealized Losses | 265 | 309
Non-investment grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | 883 | 942
Gross Unrealized Losses | $ 109 | $ 155

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