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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2019
Cash Flow Statement [Abstract]  
Summary of Cash Flow Information
(CAD$ in millions)
 
December 31,
2019

 
December 31,
2018

Cash and cash equivalents
 
 
 
 
Cash
 
$
149

 
$
438

Investments with maturities from the date of acquisition of three months or less
 
877

 
1,296

 
 
$
1,026

 
$
1,734
Summary of Non-Cash Working Capital Items
(CAD$ in millions)
 
2019

 
2018

Net change in non-cash working capital items
 
 
 
 
Trade and settlements receivables
 
$
97

 
$
282

Prepaids and other current assets
 
(69
)
 
(26
)
Inventories
 
16

 
(338
)
Trade accounts payable and other liabilities
 
(204
)
 
53

 
 
$
(160
)
 
$
(29
)