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SUPPLEMENTAL INFORMATION
 12 Months Ended
Dec. 31, 2021
Cash flows from (used in) operating activities [abstract]  
SUPPLEMENTAL INFORMATION SUPPLEMENTAL INFORMATION
The net change in working capital balances for the year ended December 31 shown in the consolidated statements of cash flows is comprised of the following:
(MILLIONS)202120202019
Trade receivables and other current assets$(515)$(2)$(66)
Accounts payable and accrued liabilities(282)(91)17 
Other assets and liabilities81 (62)(4)
 $(716)$(155)$(53)