Condensed Consolidated Statements of Comprehensive Income (Unaudited) (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	$ 775	$ 648	$ 1,391	$ 632
Other comprehensive income (loss), net of income taxes:
Defined benefit and other postretirement plan adjustments	3	2	6	6
Other	(3)	(1)	(2)	1
Other comprehensive income (loss), net of income taxes	0	1	4	7
Comprehensive income (loss)	775	649	1,395	639
Comprehensive (income) loss attributable to noncontrolling interest	(1)	(3)	5	(6)
Comprehensive income (loss) attributable to company shareholders	$ 774	$ 646	$ 1,400	$ 633