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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments [Abstract]    
Corporate cash and financial assets $ 205 $ 549
Availability under committed credit facilities 2,475 2,475
Draws on credit facility (789) 0
Commitments under credit facility (106) (46)
Corporate liquidity $ 1,785 $ 2,978