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CONSOLIDATED STATEMENTS OF CASH FLOWS - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |
Net (loss) earnings | $ (4,319) | $ 2,899
Adjustments for: |  |
Depreciation, depletion, amortization and impairment | 9,526 | 10,572
Deferred income tax recovery | (1,119) | (1,918)
Accretion | 278 | 270
Unrealized foreign exchange gain on U.S. dollar denominated debt | (312) | (624)
Change in fair value of financial instruments and trading inventory | 108 | 107
Gain on disposal of assets | (16) | (253)
Share-based compensation | (238) | 44
Exploration | 80 | 66
Settlement of decommissioning and restoration liabilities | (231) | (464)
Other | 119 | 119
Increase in non-cash working capital | (1,201) | (397)
Cash flow provided by operating activities | 2,675 | 10,421
Investing Activities |  |
Capital and exploration expenditures | (3,926) | (5,558)
Proceeds from disposal of assets | 72 | 274
Other investments | (113) | (213)
(Increase) decrease in non-cash working capital | (557) | 409
Cash flow used in investing activities | (4,524) | (5,088)
Financing Activities |  |
Net increase (decrease) in short-term debt | 1,445 | (982)
Net increase in long-term debt | 2,634 | 557
Lease liability payments | (335) | (307)
Issuance of common shares under share option plans | 29 | 90
Repurchase of common shares | (307) | (2,274)
Distributions relating to non-controlling interest | (10) | (7)
Dividends paid on common shares | (1,670) | (2,614)
Cash flow provided by (used in) financing activities | 1,786 | (5,537)
Decrease in Cash and Cash Equivalents | (63) | (204)
Effect of foreign exchange on cash and cash equivalents | (12) | (57)
Cash and cash equivalents at beginning of year | 1,960 | 2,221
Cash and Cash Equivalents at End of Year | 1,885 | 1,960
Supplementary Cash Flow Information |  |
Interest paid | 1,028 | 996
Income taxes paid | $ 695 | $ 1,033

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Balance Type: | credit
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