Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 553	$ 484
Investment expenses	(12)	(12)
Net investment income (excluding net realized losses)	541	472
Net realized capital losses	(21)	(18)
Net investment income	520	454
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	323	244
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	21	17
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 209	$ 223

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