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Consolidated Statement of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities      
Net earnings (loss) $ (90) $ (118) $ 276
Depreciation and amortization (Note 34) 710 708 664
Gain (loss) on sale of assets (Note 4) 0 (1) (1)
Accretion of provisions (Note 21) 24 23 20
Decommissioning and restoration costs settled (Note 21) (31) (19) (23)
Deferred income tax expense (recovery) (Note 11) (34) (15) 15
Unrealized (gain) loss from risk management activities 30 (48) 58
Unrealized foreign exchange (gain) loss 28 22 (1)
Provisions 7 (7) (123)
Asset impairment charges (reversals) (Note 7) 73 20 28
Other non-cash items 147 175 (242)
Cash flow from operations before changes in working capital 864 740 671
Change in non-cash operating working capital balances (Note 30) (44) (114) 73
Cash flow from operating activities 820 626 744
Investing activities      
Additions to property, plant and equipment (Note 17 and 34) (277) (338) (358)
Additions to intangibles (Note 19 and 34) (20) (51) (21)
Restricted cash (Note 22) (35) (30) 0
Loan receivable (Note 20) 1 (38) 0
Acquisition of renewable energy facilities, net of cash acquired (Note 4) (30) 0 0
Proceeds on sale of property, plant and equipment 2 3 6
Proceeds on sale of Wintering Hills facility and Solomon disposition (Note 4) 2 478 0
Income tax expense on Solomon disposition (Note 4 and 11) 0 (56) 0
Realized gains (losses) on financial instruments 2 6 (6)
Decrease in finance lease receivable 59 59 56
Other (2) (3) 2
Change in non-cash investing working capital balances (96) 57 (6)
Cash flow from (used in) investing activities (394) 87 (327)
Financing activities      
Net increase (decrease) in borrowings under credit facilities (Note 22) 312 26 (315)
Repayment of long-term debt (Note 22) (1,179) (814) (88)
Issuance of long-term debt (Note 22) 345 260 361
Net proceeds on sale of non-controlling interest in subsidiary (Note 4) 144 0 162
Repurchase of common shares under NCIB (Note 24) (23) 0 0
Realized gains (losses) on financial instruments 48 106 (2)
Distributions paid to subsidiaries' non-controlling interests (Note 12) (165) (172) (151)
Decrease in finance lease obligations (Note 22) (18) (17) (16)
Other (31) (6) (3)
Change in non-cash financing working capital balances 2 0 0
Cash flow from (used in) financing activities (651) (703) (163)
Cash flow from (used in) operating, investing, and financing activities (225) 10 254
Effect of translation on foreign currency cash 0 (1) (3)
Increase (decrease) in cash and cash equivalents (225) 9 251
Cash and cash equivalents, beginning of year 314 305 54
Cash and cash equivalents, end of year 89 314 305
Cash income taxes paid 87 14 27
Cash interest paid 188 230 235
Common shares      
Financing activities      
Dividends paid, classified as financing activities (46) (46) (69)
Preferred shares      
Financing activities      
Dividends paid, classified as financing activities $ (40) $ (40) $ (42)