Consolidated Balance Sheet Parentheticals (Unaudited at September 30, 2012) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheet (Unaudited at September 30, 2012)
Fixed maturities, available for sale, amortized cost	$ 61,003	$ 59,994
Equity securities, available for sale, cost	$ 439	$ 414
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	382.0	392.8
Common stock, shares outstanding	382.0	392.8	412.8	434.6
Treasury stock, at cost, shares	366.8	349.0