Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 1,045	$ 724
Other comprehensive income:
Change in accumulated other comprehensive income of equity method investees	(1)	3
Other Comprehensive Income (Loss), Net of Tax	(1)	3
Total comprehensive income	$ 1,044	$ 727