CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF FINANCIAL POSITION
Fixed income securities, at fair value, amortized cost (in dollars)	$ 71,915	$ 73,379
Equity securities, at fair value, cost (in dollars)	3,577	4,203
Short-term, at fair value, amortized cost (in dollars)	$ 2,336	$ 1,291
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
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	479,000,000	501,000,000
Treasury stock, shares	421,000,000	399,000,000