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Investments in Associates and Joint Ventures
 12 Months Ended
Dec. 31, 2021
Interests In Other Entities [Abstract]  
Investments in Associates and Joint Ventures Investments in Associates and Joint Ventures
(CAD$ in millions)NuevaUniónOtherTotal
At January 1, 2020
$1,071 $8 $1,079 
Contributions11 1 12 
Changes in foreign exchange rates(22)— (22)
Share of income (loss)1 (2)(1)
Other— (1)(1)
At December 31, 2020$1,061 $6 $1,067 
Contributions5 — 5 
Changes in foreign exchange rates(4)(1)(5)
Share of loss(3)— (3)
Other— (4)(4)
At December 31, 2021$1,059 $1 $1,060