CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 143	$ 193	$ 335	$ 396
Items related to employee benefit plans:
Change in net actuarial loss, net of $(15), $(2), $(30) and $(4) tax	27	3	50	6
Change in net prior service costs, net of $(3), $(3), $(5) and $(5) tax	4	5	8	8
Foreign currency translation adjustment and other, net of $-, $-, $- and $- tax	11	8	0	9
Other comprehensive income	42	16	58	23
COMPREHENSIVE INCOME	$ 185	$ 209	$ 393	$ 419