Investments (Net Inv Inc summary) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment income on fixed maturities		$ 266	$ 322
Net realized gains (losses)	[1]	69	(19)
Affordable housing partnerships		(15)	(14)
Other		21	22
Consolidated investment entities		36	17
Net investment income		377	328
Change in allowance for credit losses		$ 1	$ 24

[1] Includes the change in the allowance for credit losses of $1 million and $24 million for the three months ended March 31, 2021 and 2020, respectively.