Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 838	$ 784
Other comprehensive income:
Change in accumulated other comprehensive income (loss) of equity method investees	(2)	(2)
Other Comprehensive Income, Net of Tax	(2)	(2)
Total comprehensive income	$ 836	$ 782