FAIR VALUE MEASUREMENTS - Notional Amount of Foreign Currency Exchange Derivatives (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Losses on foreign currency exchange derivatives		$ 10		$ 0	$ 18	$ 31
Recurring Basis
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets at fair value		14,859			14,859		$ 14,054
Recurring Basis | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets at fair value		530			530		534
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Foreign currency purchases
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount		867			867		898
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Foreign currency sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount		1,559			1,559		839
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Recurring Basis
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets at fair value		8			8		9
Liabilities at fair value		11			11		7
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Recurring Basis | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets at fair value		8			8		9
Liabilities at fair value		$ 11			$ 11		$ 7
Reverse Treasury Lock | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount			$ 1,800
Unrealized losses			$ 15
Payments for reverse treasury lock agreements	$ 15