ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative foreign exchange translation adjustment	$ (2,780,000,000)	$ (2,566,000,000)
Pension and other postretirement benefit adjustments	(601,000,000)	(675,000,000)
Changes in fair value of available for sale investments	4,000,000	0
Changes in fair value of designated cash flow hedges	0	44,000,000
Accumulated Other Comprehensive Income (Loss)	(3,377,000,000)	(3,197,000,000)	$ (3,437,000,000)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign exchange translation adjustment	(211,000,000)	143,000,000	(685,000,000)
Pensions and other postretirement benefit adjustments	74,000,000	86,000,000	(606,000,000)
Changes in fair value of available for sale investments	4,000,000	0	0
Changes in fair value of designated cash flow hedges	(44,000,000)	11,000,000	85,000,000
Components of other comprehensive income (loss), net of tax	(180,000,000)	240,000,000
Accumulated Other Comprehensive Income (Loss) [Member]
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign exchange translation adjustment	(214,000,000)	143,000,000
Pension and other postretirement benefit adjustments	76,000,000	115,000,000
Changes in fair value of available for sale investments	4,000,000
Changes in fair value of designated cash flow hedges	(61,000,000)	20,000,000
Changes in accumulated other comprehensive income, pretax	(195,000,000)	278,000,000
Other Comprehensive Income (Loss), Tax [Abstract]
Foreign exchange translation adjustment	0	0
Pensions and other postretirement benefit adjustments	(2,000,000)	(29,000,000)
Changes in fair value of available for sale investments	0
Changes in fair value of designated cash flow hedges	17,000,000	(9,000,000)
Other comprehensive income (loss), tax	15,000,000	(38,000,000)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign exchange translation adjustment	(214,000,000)	143,000,000	(728,000,000)
Pensions and other postretirement benefit adjustments	74,000,000	86,000,000	(559,000,000)
Changes in fair value of available for sale investments	4,000,000
Changes in fair value of designated cash flow hedges	(44,000,000)	11,000,000	85,000,000
Components of other comprehensive income (loss), net of tax	$ (180,000,000)	$ 240,000,000
AOCI Including Spin Transactions [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign exchange translation adjustment			(728,000,000)
Pension and other postretirement benefit adjustments			(727,000,000)
Changes in fair value of designated 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 designated cash flow hedges			(17,000,000)
Other comprehensive income (loss), tax			151,000,000
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign exchange translation adjustment			(728,000,000)
Pensions and other postretirement benefit adjustments			(559,000,000)
Changes in fair value of designated cash flow hedges			85,000,000
Components of other comprehensive income (loss), net of tax			$ (1,202,000,000)