Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Available-For-Sale Impairment Losses [Abstract]
Losses on mortgage loans due to changes in expected credit losses	$ 0	$ 0	$ 0	$ 13
Fixed Maturity Securities Available-for-sale [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses (gains) recognized in earnings	(1)	11	5	103
Fixed Maturity Securities Available-for-sale [Member] | Corporate and Other Bonds [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses (gains) recognized in earnings	(2)	(1)	$ 5	90
Fixed Maturity Securities Available-for-sale [Member] | Asset-Backed [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses (gains) recognized in earnings	$ 1	$ 12		$ 13