Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available-For-Sale Impairment Losses [Abstract]
Losses on mortgage loans due to changes in expected credit losses	$ 0	$ 13
Fixed Maturity Securities Available-for-sale [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	6	92
Fixed Maturity Securities Available-for-sale [Member] | Corporate and Other Bonds [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	7	91
Fixed Maturity Securities Available-for-sale [Member] | Asset-Backed [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ (1)	$ 1