Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturities, available-for-sale, at fair value (amortized cost of $35,894 and $35,603)	$ 35,894	$ 35,603
Mortgage loans (net of allowances for loan losses of $1 and $1)	$ 1	$ 1
Preferred stock, 13,800 shares issued	13,800,000	13,800,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock aggregate liquidation preference	$ 345	$ 345
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock 384,923,222 shares issued at March 31, 2019 and December 31, 2018	384,923,222.00	384,923,222.00
Treasury stock, at cost — 24,058,244 and 25,772,238 shares	24,058,244	25,772,238