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CONSOLIDATED STATEMENTS OF CASH FLOWS - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities |  |  |  |
Net earnings (loss) |  | $ 2,397 | $ (204) | $ (637)
Non-cash items |  |  |  |
Depletion, depreciation and amortization |  | 5,186 | 4,858 | 5,483
Share-based compensation |  | 134 | 355 | (46)
Asset retirement obligation accretion |  | 164 | 142 | 173
Unrealized risk management loss |  | 37 | 25 | 374
Unrealized foreign exchange (gain) loss |  | (821) | (93) | 858
(Gain) loss from investments |  | (11) | (299) | 55
Deferred income tax expense (recovery) |  | 640 | (241) | 231
Gain on acquisition, disposition and revaluation of properties |  | (379) | (250) | (739)
Current income tax on disposition of properties |  | 0 | 0 | 33
Other |  | (110) | (32) | (22)
Abandonment expenditures |  | (274) | (267) | (370)
Net change in non-cash working capital |  | 299 | (542) | 239
Cash flows from operating activities |  | 7,262 | 3,452 | 5,632
Financing activities |  |  |  |
Issue of bank credit facilities and commercial paper, net |  | 2,222 | 342 | 970
Issue of medium-term notes, net |  | 1,791 | 998 | 107
Issue (repayment) of US dollar debt securities, net |  | 2,733 | (834) | 0
Issue of common shares on exercise of stock options |  | 466 | 559 | 91
Dividends on common shares |  | (1,252) | (758) | (1,251)
Net change in non-cash working capital |  | 0 | 0 | (40)
Cash flows from (used in) financing activities |  | 5,960 | 307 | (123)
Investing activities |  |  |  |
Net (expenditures) proceeds on exploration and evaluation assets | [1] | (124) | 6 | 236
Net expenditures on property, plant and equipment | [1],[2] | (4,574) | (3,803) | (4,704)
Acquisition of AOSP and other assets, net of cash acquired | [3] | (8,630) | 0 | 0
Current income tax on disposition of properties |  | 0 | 0 | (33)
Investment in other long-term assets |  | (87) | (99) | (112)
Net change in non-cash working capital, investing activities |  | 313 | 85 | (852)
Cash flows used in investing activities |  | (13,102) | (3,811) | (5,465)
Increase (decrease) in cash and cash equivalents |  | 120 | (52) | 44
Cash and cash equivalents – beginning of year |  | 17 | 69 | 25
Cash and cash equivalents – end of year |  | 137 | 17 | 69
Interest paid, net |  | 725 | 617 | 541
Income taxes (received) paid |  | (792) | (444) | 42
Investment in PrairieSky Royalty Ltd. |  |  |  |
Investing activities |  |  |  |
Non-cash share consideration received |  |  |  | $ 985
Disposal of Cold Lake Pipeline | Investment in Inter Pipeline Ltd. |  |  |  |
Investing activities |  |  |  |
Non-cash share consideration received |  |  | $ 190 |
AOSP |  |  |  |
Investing activities |  |  |  |
Other working capital |  | 291 |  |
Fair value of share considerations issued |  | $ 3,818 |  |
[1] | Net proceeds on exploration and evaluation assets and net expenditures on property, plant and equipment in 2015 exclude non-cash share consideration of $985 million received from PrairieSky Royalty Ltd. ("PrairieSky") on the disposition of royalty income assets.
[2] | Net expenditures on property, plant and equipment in 2016 exclude non-cash share consideration of $190 million received from Inter Pipeline Ltd. ("Inter Pipeline") on the disposition of the Company's interest in the Cold Lake Pipeline.
[3] | 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.

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