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Consolidated Statement of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net earnings (loss) $ (253) $ 176 $ (90)
Depreciation and amortization 798 709 710
Net gain on sale of assets (9) (45) 0
Accretion of provisions 30 23 24
Decommissioning and restoration costs settled (18) (34) (31)
Deferred income tax recovery (85) (18) (34)
Unrealized (gain) loss from risk management activities 42 (32) 30
Unrealized foreign exchange loss 1 13 28
Provisions 9 13 7
Asset impairment charges 84 25 73
Equity income, net of distributions from Joint Ventures (1) 0 0
Other non-cash items 15 (102) 147
Cash flow from operations before changes in working capital 613 728 864
Change in non-cash operating working capital balances 89 121 (44)
Cash flow from operating activities 702 849 820
Investing activities      
Additions to property, plant and equipment (486) (417) (277)
Additions to intangibles (14) (14) (20)
Restricted cash (39) 34 (35)
Loan receivable (5) (10)  
Loan receivable     1
Acquisitions, net of cash acquired (32) (117) (30)
Acquisition of investments (Note 10) (102) 0 0
Investment in the Pioneer Pipeline 0 (83) (15)
Proceeds on sale of property, plant and equipment 6 13 2
Realized gains on financial instruments 2 3 2
Decrease in finance lease receivable 17 24 59
Other (12) 23 15
Change in non-cash investing working capital balances (22) 32 (96)
Cash flow used in investing activities (687) (512) (394)
Financing activities      
Net increase (decrease) in borrowings under credit facilities (106) (119) 312
Repayment of long-term debt (489) (96) (1,179)
Issuance of long-term debt 753 166 345
Issuance of exchangeable securities 400 350 0
Net proceeds on sale of non-controlling interest in subsidiary 0 0 144
Repurchase of common shares under NCIB (57) (68) (23)
Realized gains on financial instruments 3 0 48
Distributions paid to subsidiaries' non-controlling interests (97) (106) (165)
Decrease in finance lease obligations (25) (21) (18)
Financing fees and other (11) (35) (31)
Change in non-cash financing working capital balances (13) 0 2
Cash flow from (used in) financing activities 272 (14) (651)
Cash flow from (used in) operating, investing, and financing activities 287 323 (225)
Effect of translation on foreign currency cash 5 (1) 0
Increase (decrease) in cash and cash equivalents 292 322 (225)
Cash and cash equivalents, beginning of year 411 89 314
Cash and cash equivalents, end of year 703 411 89
Supplemental cash flow information      
Cash income taxes paid 36 35 87
Cash interest paid 201 185 188
Common shares      
Financing activities      
Dividends paid (47) (45) (46)
Preferred shares      
Financing activities      
Dividends paid $ (39) $ (40) $ (40)