Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income	$ 724	$ 798
Other comprehensive income:
Change in amortization of accumulated actuarial losses and prior service credits, net of tax benefit of $0 million and $2 million, respectively	0	3
Change in accumulated other comprehensive income of equity method investees	3	(2)
Other Comprehensive Income (Loss), Net of Tax	3	1
Total comprehensive income	727	799
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income:
Total comprehensive income	$ 3