STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Translation Adjustment	$ (303)		$ (303)		$ (296)	$ (381)
Change in cumulative translation adjustment	(34)	$ 36	(7)	$ 43	85
Benefit Plans Unrecognized Prior Service Credits	121		121		136	163
Change in Benefit Plans Unrecognized Prior Service Credits			(15)		(27)
Unrealized Gains (Losses) on Derivative Instruments	(10)		(10)		(48)	(62)
Change in Unrealized Gains (Losses) on Derivative Instruments			38		14
Unrealized Losses on Investments	(1)		(1)		(1)	(1)
Change in Unrealized Losses on Investments			0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(193)		(193)		(209)	$ (281)
Total other comprehensive income (loss), net of tax	$ 19	$ 20	$ 16	$ (5)	$ 72

Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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