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Consolidated Statements of Cash Flows - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |
Net earnings | $ 3,293 | $ 4,458
Adjustments for: |  |
Depreciation, depletion, amortization and impairment | 5,738 | 5,601
Deferred income taxes | 440 | 249
Accretion | 266 | 247
Unrealized foreign exchange loss (gain) on U.S. dollar denominated debt | 1,090 | (771)
Change in fair value of financial instruments and trading inventory | (179) | 128
Gain on disposal of assets | (24) | (474)
Loss on extinguishment of long-term debt | 3 | 51
Share-based compensation | (117) | 31
Exploration | 11 | 41
Settlement of decommissioning and restoration liabilities | (469) | (353)
Other | 120 | (69)
Decrease (increase) in non-cash working capital | 408 | (173)
Cash flow provided by operating activities | 10,580 | 8,966
Investing Activities |  |
Capital and exploration expenditures | (5,406) | (6,551)
Acquisitions | (1,230) | (308)
Proceeds from disposal of assets | 84 | 1,611
Other investments | (170) | (38)
Decrease in non-cash working capital | 25 | 267
Cash flow used in investing activities | (6,697) | (5,019)
Financing Activities |  |
Net increase in short-term debt | 866 | 981
Net decrease in long-term debt | (186) | (3,283)
Issuance of long-term debt |  | 905
Issuance of common shares under share option plans | 286 | 228
Purchase of common shares | (3,053) | (1,413)
(Distribution) and proceeds from sale, relating to non-controlling interest | (6) | 483
Dividends paid on common shares | (2,333) | (2,124)
Cash flow (used in) provided by financing activities | (4,426) | (4,223)
Decrease in Cash and Cash Equivalents | (543) | (276)
Effect of foreign exchange on cash and cash equivalents | 92 | (68)
Cash and cash equivalents at beginning of year | 2,672 | 3,016
Cash and Cash Equivalents at End of Year | 2,221 | 2,672
Supplementary Cash Flow Information |  |
Interest paid | 800 | 941
Income taxes paid | $ 645 | $ 557

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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

X
- Definition Amount of cash inflow or outflow 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_ProceedsDistributionsFromSaleOfNonControllingInterest
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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