CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor	Dec. 31, 2009 Predecessor
NET INCOME	$ 543	$ 299	$ 1,082	$ 1,197
OTHER COMPREHENSIVE INCOME
Unrealized gain (loss) on investments and other, net of tax		1	(4)	9
Other comprehensive income		1	(4)	9
COMPREHENSIVE INCOME	$ 543	$ 300	$ 1,078	$ 1,206