Consolidated Balance Sheet Parentheticals (Unaudited at September 30, 2017) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Consolidated Balance Sheet (Unaudited at September 30, 2017)
Fixed maturities, available for sale, amortized cost	$ 60,727	$ 59,650
Equity securities, available for sale, cost	$ 509	$ 504
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	273.8	279.6
Common stock, shares outstanding (in shares)	273.7	279.6
Treasury stock, at cost (in shares)	498.3	489.5