Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 322	$ 279	$ 827	$ 822
Investment expenses	(11)	(11)	(29)	(28)
Net investment income (excluding net realized capital gains or losses)	311	268	798	794
Net realized capital gains (losses)	(110)	(22)	(283)	38
Net investment income	201	246	515	832
Credit-related impairment loss	1	0	17	0
Yield-related impairment loss	73	3	121	35
Supporting experience-rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	8	9	26	28
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	174	157	510	474
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	14	13	38	41
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 134	$ 109	$ 279	$ 307

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