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Share capital (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of classes of share capital [abstract]  
Schedule of authorized share capital
Our authorized and issued share capital as at December 31, 2021 was as follows:
AuthorizedIssued
As at December 31 (millions)202120202019202120202019
Preferred Shares
Convertible Redeemable Preferred A Shares
n/aunlimitedunlimitedn/a——
Convertible Redeemable Preferred B Shares
n/aunlimitedunlimitedn/a——
Common Shares
Class An/aunlimitedunlimitedn/a149121
Class B, redesignated as Multiple Voting Sharesunlimitedunlimitedunlimited2008265
Class Cn/aunlimitedunlimitedn/a41
Class Dn/aunlimitedunlimitedn/a33
Class E, redesignated as Subordinate Voting Sharesunlimitedunlimitedunlimited667—