CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION
Fixed income securities, at fair value, amortized cost (in dollars)	$ 58,129	$ 71,915
Equity securities, at fair value, cost (in dollars)	4,370	3,577
Short-term, at fair value, amortized cost (in dollars)	2,694	2,336
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	26,900	0
Preferred stock, shares outstanding	26,900	0
Preferred stock, shares aggregate liquidation preference (in dollars)	$ 672.5
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares issued	900,000,000	900,000,000
Common stock, shares outstanding	456,000,000	479,000,000
Treasury stock, shares	444,000,000	421,000,000