Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 35,612	$ 31,296
Equity securities, available-for-sale, at fair value, cost	$ 907	$ 878
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Common stock, shares issued (in shares)	384,923,222.00	402,923,222
Treasury stock (in shares)	28,088,186	28,974,069
Commercial Loan
Mortgage loans, allowances for loan losses	$ 1	$ 0
Cash
Variable interest entity assets	0	5
Other Liabilities
Variable interest entity liabilities	$ 0	$ 5