DERIVATIVE INSTRUMENTS - Schedule of Fair Value of Outstanding Derivative Instruments (Details) - Foreign Exchange Contract - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets	$ 42	$ 135
Derivative liabilities	410	122
Foreign currency exchange contracts designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	45
Foreign currency exchange contracts designated as hedging instruments | Other assets (non-current)
Derivatives, Fair Value [Line Items]
Derivative assets	0	1
Foreign currency exchange contracts designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	287	58
Foreign currency exchange contracts designated as hedging instruments | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	35	13
Foreign currency exchange contracts not designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	42	89
Foreign currency exchange contracts not designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 88	$ 51