CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Fixed Maturities, cost	$ 35,734	$ 35,398
Equity Securities, cost	$ 1,227	$ 1,244
Common Stock, Par Value	$ 1	$ 1
Common Stock, Shares Issued	371,980,460	371,980,460
Treasury Stock, Shares	112,807,699	110,217,445