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Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative [Line Items]
Net investment income	$ 743	$ 776	$ 2,065	$ 2,084
Without Hedge Designation | Credit default swap index - purchased
Derivative [Line Items]
Notional amount					$ 2,000
Derivative liability					$ 1
Net investment income			$ 19

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