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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments [Abstract]    
Corporate cash and financial assets $ 273 $ 238
Availability under committed credit facilities 2,475 2,475
Draws on credit facility (820) (510)
Commitments under credit facility (54) (47)
Corporate liquidity $ 1,874 $ 2,156