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Supplementary Information to Consolidated Statements of Cash Flows (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash paid for:    
Interest CAD 644 CAD 561
Income taxes 62 109
Change in non-cash operating working capital:    
Accounts receivable and other current assets 43 14
Prepaid expenses (4) (1)
Inventories 17 15
Regulatory assets - current portion (58) 57
Accounts payable and other current liabilities 25 (82)
Regulatory liabilities - current portion (1) 38
Changes in non-cash operating working capital 22 41
Non-cash investing and financing activities:    
Common share dividends reinvested 162 156
Common shares issued on business acquisition (Notes 17 and 27) 4,684 0
Additions to utility capital assets and intangible assets included in current and long-term liabilities 296 187
Commitment to purchase capital lease interest (Note 15) 48 0
Transfer of deposit on business acquisition (Note 27) 38 0
Contributions in aid of construction included in current assets 9 4
Exercise of stock options into common shares CAD 4 CAD 4