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Supplemental Information to Consolidated Statements of Cash Flows (Tables)
12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
For the Year ended December 31
millions of Canadian dollars20172016
Changes in non-cash working capital:
Receivables, net$ (176)$ (104)
Income taxes receivable 8 (23)
Inventory 31 88
Prepayments and other current assets 14 (18)
Accounts payable 3 162
Income taxes payable (17) 14
Other current liabilities 33 15
Total non-cash working capital $ (104)$ 134
Supplemental disclosure of cash paid:
Interest$ 689$ 480
Income taxes$ 63$ 57
Supplemental disclosure of non-cash activities:
Common share dividends reinvested$ 166$ 103
Beneficial Conversion Feature of the convertible debentures$ - $ 43