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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Current:    
Accounts receivable $ 1,044 $ 738
Prepayments & other assets 127 100
Total current 1,171 838
Non-current:    
Tax recovery receivables 39 52
Other assets 180 221
Total non-current $ 219 $ 273