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Consolidated Statements of Cash Flows - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities    
Profit for the year $ 3,145 $ 2,489
Depreciation and amortization 1,483 1,492
Provision for income taxes 1,365 1,425
Asset impairments (impairment reversal) 41 (163)
Gain on sale of investments and assets (892) (51)
Foreign exchange gains (16) (5)
Loss on debt repurchase 26 216
Loss (gain) on debt prepayment options 42 (51)
Net finance expense 219 212
Income taxes paid (780) (879)
Other (166) 195
Net change in non-cashworking capital items (29) 169
Net cash generated by operating activities 4,438 5,049
Investing activities    
Expenditures on property, plant and equipment (1,906) (1,621)
Capitalized production stripping costs (707) (678)
Expenditures on investments and other assets (284) (309)
Proceeds from investments and assets 1,292 126
Net cash used in investing activities (1,605) (2,482)
Financing activities    
Repurchase and repayment of debt (1,410) (1,929)
Debt interest and finance charges paid (407) (495)
Issuance of Class B subordinate voting shares 54 26
Purchase and cancellation of Class B subordinate voting shares (189) (175)
Dividends paid (172) (344)
Distributions to non-controlling interests (40) (56)
Net cash used in financing activities (2,164) (2,973)
Effect of exchange rate changes on cash and cash equivalents 113 (49)
Increase (decrease) in cash and cash equivalents 782 (455)
Cash and cash equivalents at beginning of year 952 1,407
Cash and cash equivalents at end of year $ 1,734 $ 952