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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) $ (2,379) $ 2,194 $ (2,669)
Depreciation, Depletion and Amortization 3,464 2,249 2,131
Exploration Expense 91 82 2,123
Inventory Write-Down (Reversal) 555 49 60
Deferred Income Tax Expense (Recovery) (838) (814) (794)
Unrealized (Gain) Loss on Risk Management 56 149 (1,249)
Unrealized Foreign Exchange (Gain) Loss (131) (827) 649
Re-measurement of Contingent Payment (80) 164 50
(Gain) Loss on Discontinuance     (301)
(Gain) Loss on Divestiture of Assets (81) (2) 795
Unwinding of Discount on Decommissioning Liabilities 57 58 63
Realized Inventory Write-Down (572) (71) (13)
Realized Foreign Exchange (Gain) Loss on Non-Operating Items (33) 401 206
Other 38 70 670
Net Change in Other Assets and Liabilities (72) (84) (72)
Net Change in Non-Cash Working Capital 198 (333) 505
Cash From (Used in) Operating Activities 273 3,285 2,154
Investing Activities      
Capital Expenditures – Exploration and Evaluation Assets (48) (73) (55)
Capital Expenditures – Property, Plant and Equipment (811) (1,110) (1,322)
Proceeds From Divestitures 38 1 1,050
Net Change in Investments and Other (4) (133) 9
Net Change in Non-Cash Working Capital (38) (117) (295)
Cash From (Used in) Investing Activities (863) (1,432) (613)
Net Cash Provided (Used) Before Financing Activities (590) 1,853 1,541
Financing Activities      
Issuance (Repayment) of Short-Term Borrowings 117    
Issuance of Long-Term Debt 1,326    
Repayment of Long-Term Debt (112) (2,279) (1,144)
Net Issuance (Repayment) of Revolving Long-Term Debt (220) 276 (20)
Principal Repayment of Leases (197) (150)  
Dividends Paid on Common Shares (77) (260) (245)
Other     (1)
Cash From (Used in) Financing Activities 837 (2,413) (1,410)
Foreign Exchange Gain (Loss) on Cash and Cash Equivalents Held in Foreign Currency (55) (35) 40
Increase (Decrease) in Cash and Cash Equivalents 192 (595) 171
Cash and Cash Equivalents, Beginning of Year 186 781 610
Cash and Cash Equivalents, End of Year $ 378 $ 186 $ 781