Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 8,924	$ 8,638
Equity securities, cost	2,697	2,523
Land, building and equipment, accumulated depreciation	$ 439	$ 420
Common stock, par value	$ 2	$ 2
Common stock, authorized	500	500
Common stock, issued	198	198
Common stock, outstanding	198	198
Treasury stock, shares	35	35