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ACCOUNTS PAYABLE AND OTHER
 12 Months Ended
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]  
ACCOUNTS PAYABLE AND OTHER ACCOUNTS PAYABLE AND OTHER
As of
US$ MILLIONSDec. 31, 2021Dec. 31, 2020
Current:  
Accounts payable$39 $84 
Accrued & other liabilities413 265 
Deferred revenue(1)
153 156 
Total current$605 $505 
Non-current:  
Deferred revenue(1)
$89 $76 
Provisions & other liabilities30 20 
Total non-current$119 $96 
(1)Deferred revenue relates primarily to cash contributions from third parties to build future natural gas and electricity connections at our company’s U.K. regulated distribution operation. The deferred revenue is recorded on receipt of cash payments and recognized as revenue as services are rendered over the life of the connections arrangement. Of the deferred revenue outstanding at December 31, 2021, 63% is estimated to be realized during 2022 and 37% during 2023.
Our company’s exposure to currency and liquidity risk related to trade and other payables is disclosed in Note 24, Financial Risk Management.