Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fixed maturities, amortized cost	$ 38,093	$ 37,466
Equity securities, cost	$ 974	$ 902
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	100,000,000	100,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,800,000,000	1,800,000,000
Common stock, shares issued	397,071,327	396,585,226
Treasury stock, shares	3,492,830