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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 14,743 $ 15,855
Foreign exchange contracts    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) 3,274 4,626
Foreign exchange contracts | British pounds    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 1,404 $ 2,882
Average Exchange Rate 131.00% 131.00%
Foreign exchange contracts | Canadian dollars    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 612 $ 4
Average Exchange Rate 75.00% 76.00%
Foreign exchange contracts | Australian dollars    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 609 $ 1,102
Average Exchange Rate 69.00% 73.00%
Foreign exchange contracts | Indian rupees    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 308 $ 0
Average Exchange Rate 1.30% 0.00%
Foreign exchange contracts | European Union euros    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 239 $ 365
Average Exchange Rate 121.00% 125.00%
Foreign exchange contracts | Chilean pesos    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 34 $ 242
Average Exchange Rate 0.13% 0.15%
Foreign exchange contracts | COP    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 28 $ 19
Average Exchange Rate 0.03% 0.03%
Foreign exchange contracts | Peruvian soles    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 12 $ 12
Average Exchange Rate 28.00% 29.00%
Foreign exchange contracts | Other    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 28 $ 0
Average Exchange Rate 0.00% 0.00%