STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Translation Adjustment	$ (324)		$ (324)		$ (296)	$ (381)
Change in cumulative translation adjustment	(21)	$ 17	(28)	$ 60	85
Benefit Plans Unrecognized Prior Service Credits	114		114		136	163
Change in Benefit Plans Unrecognized Prior Service Credits			(22)		(27)
Unrealized Gains (Losses) on Derivative Instruments	17		17		(48)	(62)
Change in Unrealized Gains (Losses) on Derivative Instruments			65		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	(194)		(194)		(209)	$ (281)
Total other comprehensive income (loss), net of tax	$ (1)	$ 48	$ 15	$ 43	$ 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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