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Supplementary Cash Flow Information (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash paid for    
Interest $ 1,255 $ 1,057
Income taxes 129 79
Change in working capital    
Accounts receivable and other current assets 142 (479)
Prepaid expenses (7) (22)
Inventories (1) (153)
Regulatory assets - current portion 104 (307)
Accounts payable and other current liabilities (390) 449
Regulatory liabilities - current portion 71 33
Change in working capital (81) (479)
Non-cash investing and financing activities    
Accrued capital expenditures 516 411
Common share dividends reinvested 408 364
Contributions in aid of construction $ 15 $ 13