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Supplementary Cash Flow Information
 6 Months Ended
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]  
Supplementary Cash Flow Information SUPPLEMENTARY CASH FLOW INFORMATION
Quarter EndedYear-to-Date
June 30June 30
($ millions)2020  2019  2020  2019  
Change in working capital
Accounts receivable and other current assets69  237  107  135  
Prepaid expenses29  21  25  18  
Inventories(45) (7) (1) 16  
Regulatory assets - current portion14  (10) 28  (16) 
Accounts payable and other current liabilities14  (199) (194) (256) 
Regulatory liabilities - current portion(108) (4) (146) 3  
(27) 38  (181) (100) 
Non-cash investing and financing activities
Accrued capital expenditures
367  329  367  329  
Common share dividends reinvested10  76  18  151  
Contributions in aid of construction8  12  8  12  
Exercise of stock options into common shares—  2  2  4  
Right-of-use assets obtained in exchange for operating lease liabilities
—  2  1  48