CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 356	$ 460	$ 604	$ 775
Other comprehensive income:
Gross unrealized investment gain	31	127	52	113
Effect of income taxes	(11)	(46)	(19)	(41)
Total unrealized investment gain, net of tax	20	81	33	72
Reclassification adjustment for net realized gains included in net income	(10)	(1)	(14)	(5)
Effect of income taxes	4	1	5	2
Total reclassification adjustment, net of tax	(6)	0	(9)	(3)
Other comprehensive income, net of tax	14	81	24	69
Comprehensive income	$ 370	$ 541	$ 628	$ 844