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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flow Statement [Abstract]      
Interest paid $ 507 $ 451 $ 366
Income taxes paid 427 132 33
Changes in non-cash working capital      
Accounts receivable 176 (31) 31
Prepayments and other 5 4 3
Accounts payable and other (305) 158 11
Changes in non-cash working capital, net $ (124) $ 131 $ 45