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Supplemental Disclosure of Cash Flow Information - Supplemental Schedule Of Cash Flow Information (Details) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($)
Disclosure Of Detailed Information About Cash Flows [Line Items] |  |  |  |  |
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 | 0 | 0 |  |
Accounts payable | 39 | (7) | 175 |  |
Accrued liabilities | 265 | (268) | 365 |  |
Other long-term liabilities | (23) | (351) | 469 |  |
Net changes in non-cash working capital | (1,268) | 1,001 | 612 |  |
Net change in non-cash working capital, operating activities | (1,033) | 1,346 | 299 |  |
Net change in non-cash working capital, investing activities | (235) | (345) | 313 |  |
Exploration and evaluation assets |  |  |  |  |
Expenditures on exploration and evaluation assets | 73 | 282 | 159 |  |
Net proceeds on sale of exploration and evaluation assets | 0 | (16) | (35) |  |
Net expenditures on exploration and evaluation assets | 73 | 266 | $ 124 |  |
Deferred purchase consideration payable | $ 95 | $ 118 |  |  |
Installment period | 4 years | 4 years |  |  |
Deferred purchase consideration payable | $ 95 | $ 118 |  |  |
AOSP |  |  |  |  |
Exploration and evaluation assets |  |  |  |  |
Deferred purchase consideration payable |  |  |  | $ 375 | $ 469

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