ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	$ 3,026	$ 14,690	$ 14,435	$ 14,269
Other comprehensive income before reclassifications, net	252	(78)	(236)	15
Amounts reclassified, pre-tax	6	4	12	7
Tax expense (benefit) reclassified	(1)		(2)
Balance as of end of period	4,366	14,960	4,366	14,960
Cumulative Effect, Period Of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period			(4)	0
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	(1,268)	(743)	(780)	(834)
Other comprehensive income before reclassifications, net	250	(78)	(238)	13
Amounts reclassified, pre-tax	0	0	0	0
Tax expense (benefit) reclassified	0		0
Balance as of end of period	(1,018)	(821)	(1,018)	(821)
Foreign Currency Translation \| Cumulative Effect, Period Of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period				0
Defined Benefit Pension and Post-retirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	(468)	(385)	(473)	(381)
Other comprehensive income before reclassifications, net	2	0	2	2
Amounts reclassified, pre-tax	6	4	12	7
Tax expense (benefit) reclassified	(1)		(2)
Balance as of end of period	(461)	(381)	(461)	(381)
Defined Benefit Pension and Post-retirement Plans \| Cumulative Effect, Period Of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period				(9)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	(1,736)	(1,128)	(1,253)	(1,215)
Balance as of end of period	$ (1,479)	$ (1,202)	$ (1,479)	(1,202)
Total \| Cumulative Effect, Period Of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period				$ (9)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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