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Consolidated Statements of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net earnings (loss) $ 7,664 $ (435) $ 5,416
Non-cash items      
Depletion, depreciation and amortization 5,724 6,046 5,546
Share-based compensation 514 (82) 223
Asset retirement obligation accretion 185 205 190
Unrealized risk management loss (gain) 19 (39) 13
Unrealized foreign exchange gain (205) (116) (548)
Gain on acquisitions (478) (217) 0
(Gain) loss from investments (132) 185 321
Deferred income tax expense (recovery) 399 (181) (894)
Realized foreign exchange loss (gain) 118 (166) 0
Other 13 (71) (109)
Abandonment expenditures (307) (249) (296)
Net change in non-cash working capital 964 (166) (1,033)
Cash flows from operating activities 14,478 4,714 8,829
Financing activities      
(Repayment) issuance of bank credit facilities and commercial paper, net (6,151) 338 2,025
Repayment of medium-term notes 0 (1,100) (1,000)
(Repayment) issuance of US dollar debt securities (628) 1,481 0
Settlement of long-term debt acquired (183) (397) 0
Proceeds on settlement of cross currency swaps 0 166 0
Payment of lease liabilities (209) (225) (237)
Issue of common shares on exercise of stock options 707 108 360
Dividends on common shares (2,170) (1,950) (1,743)
Purchase of common shares under Normal Course Issuer Bid (1,581) (271) (941)
Cash flows used in financing activities (10,215) (1,850) (1,536)
Investing activities      
Net expenditures on exploration and evaluation assets (1) (5) (73)
Net expenditures on property, plant and equipment (4,492) (2,555) (3,535)
Proceeds from investment 128 0 0
Repayment of North West Redwater Partnership subordinated debt advances 555 124 0
Net change in non-cash working capital 107 (383) (235)
Cash flows used in investing activities (3,703) (2,819) (7,255)
Increase in cash and cash equivalents 560 45 38
Cash and cash equivalents – beginning of year 184 139 101
Cash and cash equivalents – end of year 744 184 139
Supplemental​ Cash​ Flow​ Information​ [Abstract]      
Interest paid on long-term debt, net 672 745 865
Income taxes (received) paid (62) (29) 445
Devon      
Investing activities      
Acquisition of Devon Canada Corporation assets $ 0 $ 0 $ (3,412)