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Supplementary Information To Consolidated Statements Of Cash Flows (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in non-cash working capital    
Inventory $ (214) $ (84)
Receivables and other current assets (636) (364)
Accounts payable 423 289
Other current liabilities 193 7
Total non-cash working capital (234) (152)
Supplemental disclosure of cash paid:    
Interest 699 603
Income Taxes 67 24
Supplemental disclosure of non-cash activities:    
Common share dividends reinvested 237 214
Reclassification of long-term debt to short-term debt 500 0
(Decrease) Increase in accrued capital expenditures (13) (45)
Supplemental disclosure of operating activities:    
Net change in short-term regulatory assets and liabilities (157) $ (108)
January 2023 Settlement Of NMGC Gas Hedges [Member]    
Changes in non-cash working capital    
Receivables and other current assets 162  
Nova Scotia Cap-And-Trade Program [Member]    
Changes in non-cash working capital    
Other current liabilities $ (172)