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Non-controlling Interest In Subsidiaries (Non-controlling interest in subsidiaries) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Noncontrolling Interest [Line Items]    
Stockholders' Equity Attributable to Noncontrolling Interest $ 34 $ 35
Domlec    
Noncontrolling Interest [Line Items]    
Stockholders' Equity Attributable to Noncontrolling Interest 20 21
GBPC    
Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Amount Represented by Preferred Stock $ 14 $ 14