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Debt (Equipment Loans) (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
CAD ($)
Equipment Loan, Non-Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Term of issuance 20 years 20 years            
Maximum borrowing capacity             $ 310,000,000 $ 389,000,000
Repayment of credit facility $ 31,000,000 $ 40,000,000 $ 27,000,000 $ 33,000,000        
Non-Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings $ 542,000,000   $ 572,000,000   $ 734,000,000 $ 723,000,000    
Interest rate 5.22%   0.81%   5.22% 0.81%