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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current:    
Accounts receivable(1) $ 345 $ 356
Prepayments & other assets 49 34
Total current 394 390
Non-current:    
Other assets 101 89
Total non-current 101 89
Brazil    
Current:    
Accounts receivable(1) $ 185 $ 214