Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Fixed maturities, available-for-sale, at amortized cost	$ 80,690	$ 78,978
Fixed maturities, available-for-sale, variable interest entity assets	265	153
Fixed maturities, at fair value using the fair value option, variable interest entity assets	344	338
Short-term investment, variable interest entity assets	1
Equity securities, trading, at cost	30,454	32,928
Equity securities, available-for-sale, at cost	865	1,056
Mortgage loans loss, net of allowances	83	102
Limited partnerships and other alternative investments, variable interest entity assets	6	7
Other liabilities, variable interest entity liabilities	$ 420	$ 471
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock authorized	50,000,000	50,000,000
Convertible Preferred Stock, Shares Issued	575,000	575,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	469,746,638	469,750,171
Treasury stock, shares	33,680,760	27,211,115