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Consolidated Statements of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities      
Net earnings $ 5,416 $ 2,591 $ 2,397
Non-cash items      
Depletion, depreciation and amortization 5,546 5,161 5,186
Share-based compensation 223 (146) 134
Asset retirement obligation accretion 190 186 164
Unrealized risk management loss (gain) 13 (35) 37
Unrealized foreign exchange (gain) loss (548) 706 (821)
Realized foreign exchange loss on repayment of US dollar securities 0 146 0
Gain on acquisition, disposition and revaluation of properties 0 (452) (379)
Loss (gain) from investments 321 374 (11)
Deferred income tax (recovery) expense (894) 557 640
Other (109) (23) (110)
Abandonment expenditures (296) (290) (274)
Net change in non-cash working capital (1,033) 1,346 299
Cash flows from operating activities 8,829 10,121 7,262
Financing activities      
Issue (repayment) of bank credit facilities and commercial paper, net 2,025 (1,595) 2,222
(Repayment) issue of medium-term notes (1,000) 0 1,791
(Repayment) issue of US dollar debt securities 0 (1,236) 2,733
Payment of lease liabilities (237)    
Issue of common shares on exercise of stock options 360 332 466
Dividends on common shares (1,743) (1,562) (1,252)
Purchase of common shares under Normal Course Issuer Bid (941) (1,282) 0
Cash flows (used in) from financing activities (1,536) (5,343) 5,960
Investing activities      
Net expenditures on exploration and evaluation assets (73) (266) (124)
Net expenditures on property, plant and equipment (3,535) (4,175) (4,574)
Investment in other long-term assets 0 (28) (87)
Net change in non-cash working capital (235) (345) 313
Cash flows used in investing activities (7,255) (4,814) (13,102)
Increase (decrease) in cash and cash equivalents 38 (36) 120
Cash and cash equivalents – beginning of year 101 137 17
Cash and cash equivalents – end of year 139 101 137
Interest paid on long-term debt, net 865 911 725
Income taxes paid (received) 445 (225) (792)
Devon      
Investing activities      
Acquisition of Devon assets, AOSP and other assets, net of cash acquired [1] (3,412) 0 0
Other working capital 195    
AOSP      
Investing activities      
Acquisition of Devon assets, AOSP and other assets, net of cash acquired [2] $ 0 $ 0 (8,630)
Other working capital     291
Fair value of share considerations issued     $ 3,818
[1] The acquisition of assets from Devon Canada Corporation ("Devon") in 2019 includes net working capital and other long-term assets of $195 million (see note 7).
[2] The acquisition of AOSP in 2017 includes net working capital of $291 million and excludes non-cash share consideration of $3,818 million (see note 7).