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Supplementary Cash Flow Information (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Change in working capital        
Accounts receivable and other current assets $ 69 $ 237 $ 107 $ 135
Prepaid expenses 29 21 25 18
Inventories (45) (7) (1) 16
Regulatory assets - current portion 14 (10) 28 (16)
Accounts payable and other current liabilities 14 (199) (194) (256)
Regulatory liabilities - current portion (108) (4) (146) 3
Changes in working capital (27) 38 (181) (100)
Non-cash investing and financing activities        
Accrued capital expenditures 367 329 367 329
Common share dividends reinvested 10 76 18 151
Contributions in aid of construction 8 12 8 12
Exercise of stock options into common shares 0 2 2 4
Right-of-use assets obtained in exchange for operating lease liabilities $ 0 $ 2 $ 1 $ 48