Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Available-For-Sale Impairment Losses [Abstract]
Losses on mortgage loans due to changes in expected credit losses	$ 0	$ 3	$ 0	$ 16
Fixed Maturity Securities Available-for-sale [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	11	5	16	108
Fixed Maturity Securities Available-for-sale [Member] | Corporate and Other Bonds [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings		4	5	94
Fixed Maturity Securities Available-for-sale [Member] | Asset-Backed [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 11	$ 1	$ 11	$ 14