Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 772	$ 963	$ 1,556	$ 2,008
Other comprehensive income:
Change in Pension and Retiree Health and Welfare benefits, net of tax expense of $1 million in each of the three and six months ended June 30, 2016 and net of tax benefit of $1 million in each of the three and six months ended June 30, 2015	0	0	0	0
Change in accumulated other comprehensive income (loss) of equity method investees	1	0	(1)	(1)
Other Comprehensive (Loss) Income, Net of Tax	1	0	(1)	(1)
Total comprehensive income	$ 773	$ 963	$ 1,555	$ 2,007