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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current:    
Accounts receivable $ 738 $ 395
Prepayments & other assets 100 109
Total current 838 504
Non-current:    
Tax recovery receivables 52 55
Other assets 221 110
Total non-current $ 273 $ 165