CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF FINANCIAL POSITION
Fixed income securities, at fair value, amortized cost (in dollars)	$ 59,672	$ 59,008
Equity securities, at fair value, cost (in dollars)	3,692	4,473
Short-term, at fair value, amortized cost (in dollars)	2,540	2,393
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	72,200	32,300
Preferred stock, shares outstanding	72,200	32,300
Preferred stock, shares aggregate liquidation preference (in dollars)	$ 1,805.0	$ 807.5
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	418,000,000	449,000,000
Treasury stock, shares	482,000,000	451,000,000