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ACCOUNTS PAYABLE AND OTHER (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of accounts payable and other
US$ MILLIONSNote20202019
Current:   
Accounts payable $1,461 $973 
Accrued liabilities 751 653 
Deferred revenue(i)256 307 
Lease liabilities206 197 
Provisions(1)
 176 214 
Loans and notes payable134 — 
Other liabilities293 66 
Total current $3,277 $2,410 
Non-current:   
Lease liabilities$3,597 $1,606 
Deferred revenue(i)467 246 
Provisions(1)
 423 327 
Pension liabilities(2)
 315 148 
Loans and notes payable84 99 
Other liabilities 311 144 
Total non-current $5,197 $2,570 
(1)Provisions primarily relate to decommissioning and site restoration liabilities at our Western Canadian natural gas gathering and processing operation and our Indian telecom tower operation.
(2)See Note 31, Retirement Benefit Plans, for further details.