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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Fixed maturities, amortized cost $ 10,314 $ 9,799
Equity securities, cost 3,094 2,995
Land, building and equipment, accumulated depreciation $ 253 $ 237
Common stock, par value $ 2 $ 2
common stock, authorized 500.0 500.0
Common stock, issued 198.3 198.3
Common stock, shares outstanding 198.3 198.3
Treasury stock, shares 34.4 33.9