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Consolidated Statements of Cash Flows (unaudited) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Activities      
Net Earnings (Loss) $ 587 $ (2,379) [1] $ 2,194 [1]
Depreciation, Depletion and Amortization 5,886 3,464 2,249
Exploration Expense 9 91 82
Inventories 16 555 49
Deferred Income Tax Expense (Recovery) 452 (838) (814)
Unrealized (Gain) Loss on Risk Management 2 56 149
Unrealized Foreign Exchange (Gain) Loss (312) (131) (827)
Re-measurement of Contingent Payment, Net of Cash Paid 400 (80) 164
(Gain) Loss on Divestiture of Assets (229) (81) (2)
Unwinding of Discount on Decommissioning Liabilities 199 57 58
Realization of Inventory Write-Downs (31) (572) (71)
Realized Foreign Exchange (Gain) Loss on Non-Operating Items 171 (33) 401
(Income) Loss From Equity-Accounted Affiliates (57) 0 [1] 0 [1]
Distributions Received From Equity-Accounted Affiliates 137 0 0
Other 18 8 38
Settlement of Decommissioning Liabilities (102) (42) (52)
Net Change in Non-Cash Working Capital (1,227) 198 (333)
Cash From (Used in) Operating Activities 5,919 273 3,285
Investing Activities      
Capital Expenditures (2,563) (859) (1,183)
Proceeds From Divestitures 435 38 1
Cash Acquired Through Business Combination 735 0 0
Net Cash Received on Assumption of Decommissioning Liabilities 75 0 0
Net Change in Investments and Other 17 (4) (133)
Net Change in Non-Cash Working Capital 359 (38) (117)
Cash From (Used in) Investing Activities (942) (863) (1,432)
Net Cash Provided (Used) Before Financing Activities 4,977 (590) 1,853
Financing Activities      
Net Issuance (Repayment) of Short-Term Borrowings (77) 117 0
Issuance of Long-Term Debt 1,557 1,326 0
(Repayment) of Long-Term Debt (2,870) (112) (2,279)
Net Issuance (Repayment) of Revolving Long-Term Debt (350) (220) 276
Principal Repayment of Leases (300) (197) (150)
Purchase of Common Shares Under NCIB (265) 0 0
Other 8 0 0
Cash From (Used in) Financing Activities (2,507) 837 (2,413)
Effect of Foreign Exchange on Cash and Cash Equivalents 25 (55) (35)
Increase (Decrease) in Cash and Cash Equivalents 2,495 192 (595)
Cash and Cash Equivalents, Beginning of Year 378 186 781
Cash and Cash Equivalents, End of Year 2,873 378 186
Common shares      
Financing Activities      
Dividends paid (176) (77) (260)
Preferred Shares      
Financing Activities      
Dividends paid $ (34) $ 0 $ 0
[1] See Note 3(w) for revisions to comparative results.