Consolidated Statements of Comprehensive Income 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	$ 130	$ 129	$ 281	$ 256
Other comprehensive income, net of tax:
Unrealized gains on cash flow hedges, net of tax of $-, $-, $- and $-	0	1	0	0
Comprehensive income	$ 130	$ 130	$ 281	$ 256