Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 484	$ 449
Investment expenses	(12)	(10)
Net investment income (excluding net realized capital losses)	472	439
Net realized capital losses	(18)	(105)
Net investment income	454	334
Yield-related impairment losses	10	24
Credit-related impairment losses (reversal of losses)	0	(1)
Supporting experience-rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	8	8
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	244	191
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	17	13
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 223	$ 245

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