Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Fixed maturities, available-for-sale, at amortized cost	$ 65,261	$ 79,747
Fixed maturities, available-for-sale, variable interest entity assets	59	89
Fixed maturities, at fair value using the fair value option, variable interest entity assets	153	163
Short-term investment, variable interest entity assets	10
Equity securities, trading, at cost	23,751	26,820
Equity securities, available-for-sale, at cost	792	866
Mortgage loans loss, net of allowances	68	68
Other liabilities, variable interest entity liabilities	$ 56	$ 89
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	469,744,822	469,744,822
Treasury stock, shares	34,409,177	33,439,044