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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 659	$ 557	$ 1,737	$ 1,537
Investment expenses	(16)	(26)	(39)	(50)
Net investment income (excluding net realized capital gains or losses)	643	531	1,698	1,487
Net realized capital gains (losses)	(11)	19	(59)	(89)
Net investment income	632	550	1,639	1,398
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	339	307	986	816
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	22	20	64	56
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 298	$ 230	$ 687	$ 665

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