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ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current:    
Accounts receivable $ 1,463 $ 1,741
Prepayments & other assets 462 219
Total current 1,925 1,960
Non-current:    
Finance lease receivables 343 0
Accounts receivable 123 100
Restricted cash(1) 81 41
Tax recovery receivables 21 27
Other assets 188 89
Total non-current $ 756 $ 257