Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 449	$ 252
Investment expenses	(10)	(9)
Net investment income (excluding net realized capital losses)	439	243
Net realized capital losses	(105)	(75)
Net investment income	334	168
Credit-related impairment loss	1	38
Yield-related impairment loss	24	18
Supporting experience-rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	8	9
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	191	164
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	13	11
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 245	$ 77

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