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Other Comprehensive Income - Components of accumulated other comprehensive income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | $ (1,646) | $ (65) | $ 489
Other comprehensive income (loss) before reclassifications | 570 | (1,828) | (437)
Amounts reclassified from accumulated other comprehensive income | 400 | 247 | (117)
Net current period other comprehensive income (loss) | 970 | (1,581) | (554)
Ending balance | (676) | (1,646) | (65)
Unrealized Appreciation on Available-For-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (1,512) | 13 | 501
Other comprehensive income (loss) before reclassifications | 547 | (1,772) | (371)
Amounts reclassified from accumulated other comprehensive income | 400 | 247 | (117)
Net current period other comprehensive income (loss) | 947 | (1,525) | (488)
Ending balance | (565) | (1,512) | 13
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (134) | (78) | (12)
Other comprehensive income (loss) before reclassifications | 23 | (56) | (66)
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0
Net current period other comprehensive income (loss) | 23 | (56) | (66)
Ending balance | $ (111) | $ (134) | $ (78)

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