Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fixed maturities, available-for-sale, at amortized cost	$ 31,091	$ 45,753
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	122	132
Equity securities, trading, at cost	1,457	1,614
Equity securities, available-for-sale, at cost	379	408
Mortgage loans loss, net of allowances	13	14
Limited partnerships and other alternative investments, variable interest entity assets	4	6
Short-term investment, variable interest entity assets	10	0
Other liabilities, variable interest entity liabilities	$ 77	$ 111
Common stock, par value	$ 5,690	$ 5,690
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common stock: shares outstanding	1,000	1,000