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Investments in Associates and Joint Ventures
 12 Months Ended
Dec. 31, 2019
Interests In Other Entities [Abstract]  
Investments in Associates and Joint Ventures
Investments in Associates and Joint Ventures
(CAD$ in millions)
 
NuevaUnión

 
Other

 
Total

At January 1, 2018
 
$
929

 
$
14

 
$
943

Contributions
 
48

 
—

 
48

Changes in foreign exchange rates
 
83

 
—

 
83

Share of loss
 
(2
)
 
(1
)
 
(3
)
At December 31, 2018
 
$
1,058

 
$
13

 
$
1,071

Contributions
 
67

 
1

 
68

Changes in foreign exchange rates
 
(52
)
 
—

 
(52
)
Share of loss
 
(2
)
 
(1
)
 
(3
)
Other
 
—

 
(5
)
 
(5
)
At December 31, 2019
 
$
1,071

 
$
8

 
$
1,079