CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 196	$ 143	$ 432	$ 335
Items related to employee benefit plans:
Change in net actuarial loss, net of $(17), $(15), $(33) and $(30) tax	28	27	54	50
Change in net prior service costs, net of $(1), $(3), $(2) and $(5) tax	2	4	4	8
Foreign currency translation adjustment and other, net of $-, $-, $- and $- tax	(4)	11	(5)	0
Other comprehensive income	26	42	53	58
COMPREHENSIVE INCOME	$ 222	$ 185	$ 485	$ 393