Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 136	$ 180	$ 403	$ 386
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $0, $0, $0 and $1, respectively	1	1	0	2
Comprehensive income	$ 137	$ 181	$ 403	$ 388