Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 916	$ 884	$ 1,640	$ 1,682
Other comprehensive income:
Change in amortization of accumulated actuarial losses and prior service credits, net of tax benefit of $0 million, $2 million, $0 million and $4 million, respectively	0	3	0	6
Change in accumulated other comprehensive income of equity method investees	0	1	3	(1)
Other Comprehensive Income (Loss), Net of Tax	0	4	3	5
Total comprehensive income	916	888	1,643	1,687
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income:
Total comprehensive income			$ 3