Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed-maturity securities, available-for-sale, at fair value	$ 9,884	$ 10,187
Common stock par value (per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	103,672,592	116,020,852
Common stock, shares outstanding	103,672,592	116,020,852
Accumulated other comprehensive income, tax provision	$ 38	$ 89