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Supplemental Disclosure of Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Of Cash Flows, Additional Disclosures [Abstract] |
Schedule Of Cash Flow Supplemental Disclosures |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Changes in non-cash working capital |  |  |  |  |  |  |  |
Accounts receivable |  | $ | (1,310 | ) |  | $ | 1,233 |  |  | $ | (977 | )
Current income tax (liabilities) assets |  | (164 | ) |  | 471 |  |  | 527 |
Inventory |  | (194 | ) |  | (74 | ) |  | 81 |
Prepaids and other |  | 2 |  |  | (3 | ) |  | (28 | )
Other long-term assets |  | 117 |  |  | — |  |  | — |
Accounts payable |  | 39 |  |  | (7 | ) |  | 175 |
Accrued liabilities |  | 265 |  |  | (268 | ) |  | 365 |
Other long-term liabilities (1) (2) |  | (23 | ) |  | (351 | ) |  | 469 |
Net changes in non-cash working capital |  | $ | (1,268 | ) |  | $ | 1,001 |  |  | $ | 612 |
Relating to: |  |  |  |  |  |  |  |  |
Operating activities |  | $ | (1,033 | ) |  | $ | 1,346 |  |  | $ | 299 |
Investing activities |  | (235 | ) |  | (345 | ) |  | 313 |
|  | $ | (1,268 | ) |  | $ | 1,001 |  |  | $ | 612 |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Expenditures on exploration and evaluation assets |  | $ | 73 |  |  | $ | 282 |  |  | $ | 159 |
Net proceeds on sale of exploration and evaluation assets |  | — |  |  | (16 | ) |  | (35 | )
Net expenditures on exploration and evaluation assets |  | $ | 73 |  |  | $ | 266 |  |  | $ | 124 |
(1) | Included in other long-term liabilities at December 31, 2019 is $95 million of deferred purchase consideration payable over the next four years (December 31, 2018 – $118 million).
(2) | Included in other long-term liabilities at December 31, 2017 is $469 million (US$375 million) of deferred purchase consideration paid to Marathon.
Reconciliation of liabilities arising from financing activities | The following table summarizes movements in the Company's liabilities arising from financing activities for the years' ended December 31, 2019 and 2018:
|  | Long-term debt |  |  | Cash flow hedges on US dollar debt securities |  |  | Lease liabilities |  |  | Liabilities from financing activities |
At December 31, 2017 |  | $ | 22,458 |  |  | $ | (139 | ) |  | $ | — |  |  | $ | 22,319 |
Changes from financing cash flows: |  |  |  |  |  |  |  |
Repayment of long-term debt, net (1) |  | (2,831 | ) |  | — |  |  | — |  |  | (2,831 | )
Changes in foreign exchange and fair value (2) |  | 996 |  |  | (222 | ) |  | — |  |  | 774 |
At December 31, 2018 |  | 20,623 |  |  | (361 | ) |  | — |  |  | 20,262 |
Adoption of IFRS 16 (3) |  | — |  |  | — |  |  | 1,539 |  |  | 1,539 |
At January 1, 2019 |  | 20,623 |  |  | (361 | ) |  | 1,539 |  |  | 21,801 |
Changes from financing cash flows: |  |  |  |  |  |  |  |
Issue of long-term debt, net (1) |  | 1,025 |  |  | — |  |  | — |  |  | 1,025 |
Payment of lease liabilities |  | — |  |  | — |  |  | (237 | ) |  | (237 | )
Non-cash changes: |  |  |  |  |  |  |  |
Lease additions |  | — |  |  | — |  |  | 527 |  |  | 527 |
Changes in foreign exchange and fair value (2) |  | (666 | ) |  | 162 |  |  | (20 | ) |  | (524 | )
At December 31, 2019 |  | $ | 20,982 |  |  | $ | (199 | ) |  | $ | 1,809 |  |  | $ | 22,592 |
(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, the amortization of original issue discounts and premiums and directly attributable transaction costs, and derecognitions of lease liabilities.
(3) | The Company adopted IFRS 16 "Leases" on January 1, 2019 using the modified retrospective approach (see note 2).

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