CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Receivables, allowances	$ 5	$ 5
Investments in fixed maturities at cost	$ 30	$ 31
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	10	10
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	250	250
Common stock, shares issued	159	158
Common stock, shares outstanding	135	136