Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 36,209	$ 35,836
Fixed maturities, allowance for credit losses	17	0
Equity securities, cost	183	196
Mortgage loans on real estate valuation allowance		1
Securities pledged, amortized costs	950	1,264
Preferred stock, aggregate liquidation preference	$ 625	$ 625
Preferred stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	900,000,000	900,000,000
Common stock, shares issued	143,048,960	140,726,677
Common stock, shares outstanding	126,167,913	132,325,790
Treasury stock, shares	16,881,047	8,400,887
Common stock, par value	$ 0.01	$ 0.01