CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Income and Comprehensive Income
Net income	$ 76	$ 23	$ 101	$ 4
Other comprehensive income (loss), net of tax:
Actuarial gain (loss) relating to postretirement benefit plans	0	0	1	(1)
Total other comprehensive income, net of tax	0	0	1	(1)
Comprehensive income	$ 76	$ 23	$ 102	$ 3