Consolidated Balance Sheet Parentheticals (Unaudited at June 30, 2012) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Balance Sheet Parentheticals (Unaudited at June 30, 2012)
Fixed maturities, available for sale, amortized cost	$ 60,313	$ 59,994
Equity securities, available for sale, cost	$ 436	$ 414
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	386.0	392.8
Common stock, shares outstanding	386.0	392.8	419.5	434.6
Treasury stock, at cost, shares	361.4	349.0