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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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