CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
NET (LOSS) INCOME	$ (6,165)	$ 115
Items related to employee benefit plans:
Change in net actuarial loss, net of ($14) and ($11) tax	43	33
Change in net prior service credit, net of ($1) and ($1) tax	1	2
Unrealized holding loss on interest rate swaps, net of $6 and $— tax	(17)
Foreign currency translation adjustment and other net of ($1) and ($14) tax	5	79
Other comprehensive income	32	114
COMPREHENSIVE (LOSS) INCOME	$ (6,133)	$ 229