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Consolidated Statements of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net earnings (loss) $ (435) $ 5,416 $ 2,591
Non-cash items      
Depletion, depreciation and amortization 6,046 5,546 5,161
Share-based compensation (82) 223 (146)
Asset retirement obligation accretion 205 190 186
Unrealized risk management (gain) loss (39) 13 (35)
Unrealized foreign exchange (gain) loss (116) (548) 706
Realized foreign exchange gain on settlement of cross currency swaps (166) 0 0
Realized foreign exchange loss on repayment of US dollar debt securities 0 0 146
Gain on acquisition, disposition and revaluation (217) 0 (452)
Loss from investments 185 321 374
Deferred income tax (recovery) expense (181) (894) 557
Other (71) (109) (23)
Abandonment expenditures (249) (296) (290)
Net change in non-cash working capital (166) (1,033) 1,346
Cash flows from operating activities 4,714 8,829 10,121
Financing activities      
Issue (repayment) of bank credit facilities and commercial paper, net 338 2,025 (1,595)
Repayment of medium-term notes (1,100) (1,000) 0
Issue (repayment) of US dollar debt securities 1,481 0 (1,236)
Settlement of Painted Pony long-term debt (397) 0 0
Proceeds on settlement of cross currency swaps 166 0 0
Payment of lease liabilities (225) (237)  
Issue of common shares on exercise of stock options 108 360 332
Dividends on common shares (1,950) (1,743) (1,562)
Purchase of common shares under Normal Course Issuer Bid (271) (941) (1,282)
Cash flows used in financing activities (1,850) (1,536) (5,343)
Investing activities      
Net expenditures on exploration and evaluation assets (5) (73) (266)
Net expenditures on property, plant and equipment (2,555) (3,535) (4,175)
Repayment of NWRP subordinated debt advances 124 0 0
Investment in other long-term assets 0 0 (28)
Net change in non-cash working capital (383) (235) (345)
Cash flows used in investing activities (2,819) (7,255) (4,814)
Increase (decrease) in cash and cash equivalents 45 38 (36)
Cash and cash equivalents – beginning of year 139 101 137
Cash and cash equivalents – end of year 184 139 101
Supplemental​ Cash​ Flow​ Information​ [Abstract]      
Interest paid on long-term debt, net 745 865 911
Income taxes (received) paid (29) 445 (225)
Devon      
Investing activities      
Acquisition of Devon assets [1] $ 0 (3,412) $ 0
Supplemental​ Cash​ Flow​ Information​ [Abstract]      
Other working capital   $ 195  
[1] The acquisition of assets from Devon Canada Corporation ("Devon") in 2019 includes net working capital and other long-term assets of $195 million (note 7).