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Consolidated Statements of Cash Flows CAD in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Operating Activities |  |  |
Net earnings |  | CAD 4,458.0 | CAD 445.0
Adjustments for: |  |  |
Depreciation, depletion, amortization and impairment |  | 5,601.0 | 6,117.0
Deferred income taxes |  | 249.0 | (512.0)
Accretion |  | 247.0 | 269.0
Unrealized foreign exchange gain on U.S. dollar denominated debt |  | (771.0) | (458.0)
Change in fair value of financial instruments and trading inventory |  | 128.0 | (7.0)
Gain on disposal of assets |  | (474.0) | (68.0)
Loss on extinguishment of long-term debt |  | 51.0 | 99.0
Share-based compensation |  | 31.0 | 142.0
Exploration |  | 41.0 | 204.0
Settlement of decommissioning and restoration liabilities |  | (353.0) | (269.0)
Other |  | (69.0) | 26.0
Increase in non-cash working capital |  | (173.0) | (308.0)
Cash flow provided by operating activities |  | 8,966.0 | 5,680.0
Investing Activities |  |  |
Capital and exploration expenditures |  | (6,551.0) | (6,582.0)
Cash acquired from Canadian Oil Sands Limited |  |  | 109.0
Acquisitions |  | (308.0) | (1,014.0)
Proceeds from disposal of assets | [1] | 1,611.0 | 229.0
Other investments |  | (38.0) | (25.0)
Decrease (increase) in non-cash working capital |  | 267.0 | (224.0)
Cash flow used in investing activities |  | (5,019.0) | (7,507.0)
Financing Activities |  |  |
Net change in short-term debt |  | 981.0 | 531.0
Repayment of long-term debt |  | (3,283.0) | (1,693.0)
Issuance of long-term debt |  | 905.0 | 993.0
Issuance of common shares under share option plans |  | 228.0 | 133.0
(Purchase) issuance of common shares |  | (1,413.0) | 2,782.0
Proceeds from sale of non-controlling interest |  | 483.0 |
Dividends paid on common shares |  | (2,124.0) | (1,877.0)
Cash flow (used in) provided by financing activities |  | (4,223.0) | 869.0
Decrease in Cash and Cash Equivalents |  | (276.0) | (958.0)
Effect of foreign exchange on cash and cash equivalents |  | (68.0) | (75.0)
Cash and cash equivalents at beginning of year |  | 3,016.0 | 4,049.0
Cash and Cash Equivalents at End of Year |  | 2,672.0 | 3,016.0
Supplementary Information Cash Flow [Abstract] |  |  |
Interest paid |  | 941.0 | 992.0
Income taxes paid (received) |  | 557.0 | (161.0)
Property damage insurance proceeds |  | CAD 76.0 | CAD 41.0
[1] | Includes property damage insurance proceeds of $76 million for Syncrude.

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Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow from acquisition activities. + References No definition available. + Details
Name: | su_CashInflowFromAcquisition
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity including a realized gain on foreign currency hedges. + References No definition available. + Details
Name: | su_GainLossOnExtinguishmentOfLongTermDebtIncludingRealizedGainOnForeignCurrencyHedges
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition (Increase) Decrease in non-cash working capital from assets and liabilities used for investing activities. + References No definition available. + Details
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition (Increase) Decrease in non-cash working capital from assets and liabilities used for operating activities. + References No definition available. + Details
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash paid for interest during the period classified as supplementary cash flow information. + References No definition available. + Details
Name: | su_InterestPaidClassifiedAsSupplementaryCashFlowInformation
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow or (outflow) related to the issuance or purchase of common shares. + References No definition available. + Details
Name: | su_IssuancePurchaseOfCommonShares
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References No definition available. + Details
Name: | su_ProceedsFromSaleOfNonControllingInterest
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition n/a + References No definition available. + Details
Name: | su_SupplementaryInformationCashFlowAbstract
Namespace Prefix: | su_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration