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Supplemental Information to Consolidated Statements of Cash Flows (Tables)
12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
For the Year ended December 31
millions of Canadian dollars20182017
Changes in non-cash working capital:
Inventory$ (44)$ 31
Receivables and other current assets (144) (154)
Accounts payable 59 3
Other current liabilities 13 16
Total non-cash working capital $ (116)$ (104)
Supplemental disclosure of cash paid:
Interest$ 653$ 689
Income taxes$ 33$ 63
Supplemental disclosure of non-cash activities:
Common share dividends reinvested$ 181$ 166
Change in accrued capital expenditures$ (50)$ 13
Issuance of depository receipts$ 22$ -