EQUITY - Reclassifications Out of Accumulated Other Comprehensive Loss (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Stockholders' Equity Note [Abstract]
Actuarial loss and prior service cost	$ (86)	[1]
Tax benefit	17
Total, net of tax	(69)
Currency exchange contracts	(8)
Tax benefit	2
Total, net of tax	(6)
Total reclassifications for the period	$ (75)

[1] These components of Accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 6 for additional information about pension and other postretirement benefits items.