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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments [Abstract]    
Corporate cash and financial assets $ 238 $ 205
Availability under committed credit facilities 2,475 2,475
Draws on credit facility (510) (789)
Commitments under credit facility (47) (106)
Corporate liquidity $ 2,156 $ 1,785