Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 383	$ 253	$ 832	$ 505
Investment expenses	(11)	(9)	(21)	(18)
Net investment income (excluding net realized capital losses)	372	244	811	487
Net realized capital losses	(98)	(98)	(203)	(173)
Net investment income	274	146	608	314
Credit-related impairment loss (reversal of loss)	(2)	(22)	(3)	16
Yield-related impairment loss	37	30	61	48
Supporting experience-rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	9	9	17	18
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	204	172	395	336
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	14	13	27	24
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 165	$ 68	$ 410	$ 145

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