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Adoption of IFRS 15 - Consolidated statements of cash flows (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Net earnings | $ 755 | $ 814 | $ 1,464 | $ 1,502
Depreciation and amortization | 1,008 | 977 | 2,000 | 1,886
Income taxes | 292 | 298 | 527 | 548
Net change in operating assets and liabilities | 174 | 241 | 85 | 55
Cash flows from operating activities | $ 2,057 | 2,154 | $ 3,553 | 3,467
2017 as previously reported | IFRS 15 |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Net earnings |  | 811 |  | 1,536
Depreciation and amortization |  | 980 |  | 1,887
Income taxes |  | 297 |  | 560
Net change in operating assets and liabilities |  | 242 |  | 8
Cash flows from operating activities |  | 2,154 |  | 3,467
IFRS 15 impacts | IFRS 15 |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Net earnings |  | 3 |  | (34)
Depreciation and amortization |  | (3) |  | (1)
Income taxes |  | 1 |  | (12)
Net change in operating assets and liabilities |  | (1) |  | 47
Cash flows from operating activities |  | $ 0 |  | $ 0

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- Definition Adjustments for depreciation and amortisation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Depreciation and amortisation expense; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20_b&doctype=Standard -URIDate 2017-03-09 + Details
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