Consolidated Balance Sheet Parentheticals (Unaudited at June 30, 2013) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheet (Unaudited at June 30, 2013)
Fixed maturities, available for sale, amortized cost	$ 60,494	$ 60,829
Equity securities, available for sale, cost	$ 463	$ 462
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	373.5	377.4
Common stock, shares outstanding	373.5	377.4	386.0	392.8
Treasury stock, at cost, shares	380.3	372.3