ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Abstract]
Cumulative foreign exchange translation adjustment	$ (2,709,000,000)	$ (1,981,000,000)
Pension and other postretirement benefit adjustments	(761,000,000)	(202,000,000)
Fair value of effective cash flow hedges	33,000,000	(52,000,000)
Accumulated Other Comprehensive Income (Loss)	(3,437,000,000)	(2,235,000,000)	$ (2,714,000,000)
Other Comprehensive Income Loss Before Tax Period Increase Decrease [Abstract]
Foreign exchange translation adjustment		(37,000,000)	(52,000,000)
Pension and other postretirement benefit adjustments		847,000,000	(336,000,000)
Changes in fair value of effective cash flow hedges		(194,000,000)	134,000,000
Changes in accumulated other comprehensive income, pretax		616,000,000	(254,000,000)
Other Comprehensive Income Loss Tax [Abstract]
Foreign exchange translation adjustment		0	0
Pensions and other postretirement benefit adjustments		(170,000,000)	101,000,000
Changes in fair value of effective cash flow hedges		33,000,000	(26,000,000)
Other comprehensive income (loss), tax		(137,000,000)	75,000,000
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Foreign exchange translation adjustment	(685,000,000)	(37,000,000)	(52,000,000)
Pensions and other postretirement benefit adjustments	(606,000,000)	677,000,000	(235,000,000)
Changes in fair value of effective cash flow hedges	85,000,000	(161,000,000)	108,000,000
Components of other comprehensive income (loss), net of tax	(1,202,000,000)	$ 479,000,000	$ (179,000,000)
AOCI Including Spin Transactions [Member]
Other Comprehensive Income Loss Before Tax Period Increase Decrease [Abstract]
Foreign exchange translation adjustment	(728,000,000)
Pension and other postretirement benefit adjustments	(727,000,000)
Changes in fair value of effective cash flow hedges	102,000,000
Changes in accumulated other comprehensive income, pretax	(1,353,000,000)
Other Comprehensive Income Loss Tax [Abstract]
Foreign exchange translation adjustment	0
Pensions and other postretirement benefit adjustments	168,000,000
Changes in fair value of effective cash flow hedges	(17,000,000)
Other comprehensive income (loss), tax	151,000,000
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Foreign exchange translation adjustment	(728,000,000)
Pensions and other postretirement benefit adjustments	(559,000,000)
Changes in fair value of effective cash flow hedges	85,000,000
Components of other comprehensive income (loss), net of tax	$ (1,202,000,000)