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CONSOLIDATED STATEMENTS OF CASH FLOWS - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating Activities |  |
Net earnings | $ 2,899 | $ 3,293
Adjustments for: |  |
Depreciation, depletion, amortization and impairment | 10,572 | 5,738
Deferred income tax (recovery) expense | (1,918) | 440
Accretion | 270 | 266
Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt | (624) | 1,090
Change in fair value of financial instruments and trading inventory | 107 | (179)
Gain on asset exchange and disposals | (253) | (24)
Share-based compensation | 44 | (117)
Exploration | 66 | 11
Settlement of decommissioning and restoration liabilities | (464) | (469)
Other | 119 | 123
(Increase) decrease in non-cash working capital | (397) | 408
Cash flow provided by operating activities | 10,421 | 10,580
Investing Activities |  |
Capital and exploration expenditures | (5,558) | (5,406)
Acquisitions |  | (1,230)
Proceeds from disposal of assets | 274 | 84
Other investments | (213) | (170)
Decrease in non-cash working capital | 409 | 25
Cash flow used in investing activities | (5,088) | (6,697)
Financing Activities |  |
Net (decrease) increase in short-term debt | (982) | 866
Net increase (decrease) in long-term debt | 557 | (186)
Lease liability payments | (307) |
Issuance of common shares under share option plans | 90 | 286
Purchase of common shares | (2,274) | (3,053)
Distributions relating to non-controlling interest | (7) | (6)
Dividends paid on common shares | (2,614) | (2,333)
Cash flow (used in) provided by financing activities | (5,537) | (4,426)
Decrease in Cash and Cash Equivalents | (204) | (543)
Effect of foreign exchange on cash and cash equivalents | (57) | 92
Cash and cash equivalents at beginning of year | 2,221 | 2,672
Cash and Cash Equivalents at End of Year | 1,960 | 2,221
Supplementary Cash Flow Information |  |
Interest paid | 996 | 800
Income taxes paid | $ 1,033 | $ 645

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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