CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 17	$ 196	$ 180	$ 432
Items related to employee benefit plans:
Change in net actuarial loss, net of $(22), $(17), $(42) and $(33) tax	30	28	61	54
Change in net prior service costs, net of $(1), $(1), $(2) and $(2) tax	2	2	4	4
Foreign currency translation adjustment and other, net of $—, $—, $— and $— tax	4	(4)	2	(5)
Other comprehensive income	36	26	67	53
COMPREHENSIVE INCOME	$ 53	$ 222	$ 247	$ 485