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SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Of Cash Flows, Additional Disclosures [Abstract] |
Schedule Of Cash Flow Supplemental Disclosures |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Changes in non-cash working capital |  |  |  |  |  |  |  |
Accounts receivable |  | $ | (977 | ) |  | $ | (142 | ) |  | $ | 615 |
Current income tax assets |  | 527 |  |  | (165 | ) |  | (447 | )
Inventory |  | 81 |  |  | (79 | ) |  | 142 |
Prepaids and other |  | (28 | ) |  | 14 |  |  | 11 |
Accounts payable |  | 175 |  |  | 31 |  |  | 7 |
Accrued liabilities |  | 365 |  |  | (116 | ) |  | (981 | )
Other long-term liabilities (1) |  | 469 |  |  | — |  |  | — |
Net changes in non-cash working capital |  | $ | 612 |  |  | $ | (457 | ) |  | $ | (653 | )
Relating to: |  |  |  |  |  |  |  |  |
Operating activities |  | $ | 299 |  |  | $ | (542 | ) |  | $ | 239 |
Financing activities |  | — |  |  | — |  |  | (40 | )
Investing activities |  | 313 |  |  | 85 |  |  | (852 | )
|  | $ | 612 |  |  | $ | (457 | ) |  | $ | (653 | )
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expenditures on exploration and evaluation assets |  | $ | 159 |  |  | $ | 29 |  |  | $ | 180 |
Net proceeds on sale of exploration and evaluation assets (2) |  | (35 | ) |  | (35 | ) |  | (416 | )
Net expenditures (proceeds) on exploration and evaluation assets |  | $ | 124 |  |  | $ | (6 | ) |  | $ | (236 | )
Expenditures on property, plant and equipment |  | $ | 4,574 |  |  | $ | 4,152 |  |  | $ | 5,118 |
Net proceeds on sale of property, plant and equipment (2) (3) |  | — |  |  | (349 | ) |  | (414 | )
Net expenditures on property, plant and equipment |  | $ | 4,574 |  |  | $ | 3,803 |  |  | $ | 4,704 |
(1) | Included in other long-term liabilities at December 31, 2017 is $469 million (US$375 million) of deferred purchase consideration payable to Marathon in March 2018.
(2) | 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 on the disposition of royalty income assets.
(3) | Net expenditures on property, plant and equipment in 2016 exclude non-cash share consideration of $190 million received from Inter Pipeline on the disposition of the Company's interest in the Cold Lake Pipeline.
Reconciliation of liabilities arising from financing activities | The following table summarizes movements in the Company's liabilities arising from financing activities for the year ended December 31, 2017:
|  | Long-term debt |  |  | Cash flow hedges on US dollar debt securities |  |  | Liabilities from financing activities |
At December 31, 2016 |  | $ | 16,805 |  |  | $ | (485 | ) |  | $ | 16,320 |
Changes from financing cash flows: |  |  |  |  |  |
Issue of long-term debt, net (1) |  | 6,622 |  |  | — |  |  | 6,622 |
Settlement of hedge instruments, net |  | — |  |  | 124 |  |  | 124 |
Changes in foreign exchange and fair value (2) |  | (969 | ) |  | 222 |  |  | (747 | )
At December 31, 2017 |  | $ | 22,458 |  |  | $ | (139 | ) |  | $ | 22,319 |
(1) | Includes original issue discounts and premiums, and directly attributable transaction costs.
(2) | Includes foreign exchange (gain) loss, changes in the fair value of cash flow hedges on US dollar debt and the amortization of original issue discounts and premiums and directly attributable transaction costs.

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