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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current:    
Accounts receivable $ 1,741 $ 1,044
Prepayments & other assets 219 127
Total current 1,960 1,171
Non-current:    
Tax recovery receivables 27 39
Other assets 230 180
Total non-current $ 257 $ 219