Consolidated Balance Sheet Parentheticals (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Jun. 07, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Balance Sheet Parentheticals
Fixed maturities, available for sale, amortized cost	$ 59,994		$ 60,170
Equity securities, available for sale, cost	$ 414		$ 372
Preferred Stock Savings Plan - convertible preferred stock, shares issued	0		200,000
Preferred Stock Savings Plan - convertible preferred stock, shares outstanding	0	190,083	200,000
Common stock, shares authorized	1,750,000,000		1,748,600,000
Common stock, shares issued	392,800,000		434,600,000
Common stock, shares outstanding	392,800,000		434,600,000	520,300,000	585,100,000
Treasury stock, at cost, shares	349,000,000		296,600,000