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SUPPLEMENTAL INFORMATION
 12 Months Ended
Dec. 31, 2019
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)
2019

 
2018

 
2017

Trade receivables and other current assets
$
(41
)
 
$
(122
)
 
$
(40
)
Accounts payable and accrued liabilities
8

 
32

 
32

Other assets and liabilities
(54
)
 
22

 
(17
)
 
$
(87
)
 
$
(68
)
 
$
(25
)