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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 285	$ 141	$ 543	$ 347
Investment expenses	(9)	(9)	(17)	(17)
Net investment income (excluding net realized capital gains or losses)	276	132	526	330
Net realized capital gains	13	52	60	16
Net investment income	289	184	586	346
Yield-related impairment loss	2	1	32	42
Credit-related impairment loss (gain)	0	(42)	0	3
Supporting experience-rated products
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	10	10	19	21
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	160	146	317	290
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	13	15	28	30
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 112	$ (20)	$ 198	$ 27

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