ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	$ 4,366	$ 14,960	$ 14,435	$ 14,269
Balance as of end of period	5,437	14,644	5,437	14,644
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	(1,018)	(821)	(780)	(834)
Other comprehensive income (loss) before reclassifications, net	302	(274)	64	(261)
Amounts reclassified, pre-tax	0	0	0	0
Tax expense (benefit) reclassified	0		0
Balance as of end of period	(716)	(1,095)	(716)	(1,095)
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	(461)	(381)	(473)	(381)
Other comprehensive income (loss) before reclassifications, net	0	0	2	2
Amounts reclassified, pre-tax	6	2	18	9
Tax expense (benefit) reclassified	(1)		(3)
Balance as of end of period	(456)	(379)	(456)	(379)
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)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance as of beginning of period	(1,479)	(1,202)	(1,253)	(1,215)
Other comprehensive income (loss) before reclassifications, net	302	(274)	66	(259)
Amounts reclassified, pre-tax	6	2	18	9
Tax expense (benefit) reclassified	(1)		(3)
Balance as of end of period	$ (1,172)	$ (1,474)	$ (1,172)	(1,474)
Accumulated Other Comprehensive Loss \| 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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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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