FAIR VALUE MEASUREMENTS (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 21,273,000,000	$ 17,896,000,000
Derivative Fair Value Of Derivative Asset	396,000,000	380,000,000
Derivative Fair Value Of Derivative Liability	200,000,000	34,000,000
Foreign currency exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	16,123,000,000	12,746,000,000
Fair Value, Inputs, Level 2 [Member] | Foreign currency exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Fair Value Of Derivative Asset	202,000,000	291,000,000
Derivative Fair Value Of Derivative Liability	150,000,000	21,000,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Fair Value Of Derivative Asset	194,000,000	38,000,000
Derivative Fair Value Of Derivative Liability	0	13,000,000
Fair Value, Inputs, Level 2 [Member] | Currency Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Fair Value Of Derivative Asset	0	51,000,000
Derivative Fair Value Of Derivative Liability	50,000,000	0
Fair Value Inputs Level 1 And Level 2 [Member] | Available for sale investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments	$ 1,118,000,000	$ 1,523,000,000