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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Notional Amount (U.S. Dollars) $ 9,966 $ 8,829
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) 3,482 3,816
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) $ 1,184 $ 1,214
Average Exchange Rate 75.00% 74.00%
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) $ 1,263 $ 2,069
Average Exchange Rate 136.00% 130.00%
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) $ 461 $ 491
Average Exchange Rate 122.00% 117.00%
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) $ 308 $ 42
Average Exchange Rate 78.00% 77.00%
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) $ 255 $ 0
Average Exchange Rate 0.00% 0.00%
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) $ 11 $ 0
Average Exchange Rate 30.00% 0.00%