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CONSOLIDATED STATEMENTS OF CASH FLOWS - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Operating Activities |  |
Net (loss) earnings | $ 4,119 | $ (4,319)
Adjustments for: |  |
Depreciation, depletion, amortization and impairment | 5,850 | 9,526
Deferred income tax expense (recovery) | 56 | (1,119)
Accretion | 304 | 278
Unrealized foreign exchange gain on U.S. dollar denominated debt | (113) | (312)
Change in fair value of financial instruments and trading inventory | (13) | 108
Gain on disposal of assets | (257) | (16)
Loss on extinguishment of long-term debt | 80 |
Share-based compensation | 205 | (238)
Exploration |  | 80
Settlement of decommissioning and restoration liabilities | (263) | (231)
Other | 289 | 119
Decrease (increase) in non-cash working capital | 1,507 | (1,201)
Cash flow provided by operating activities | 11,764 | 2,675
Investing Activities |  |
Capital and exploration expenditures | (4,555) | (3,926)
Proceeds from disposal of assets | 335 | 72
Other investments | (28) | (113)
Decrease (increase) in non-cash working capital | 271 | (557)
Cash flow used in investing activities | (3,977) | (4,524)
Financing Activities |  |
Net (decrease) increase in short-term debt | (2,256) | 1,445
Net (decrease) increase in long-term debt | (2,451) |
Issuance of long-term debt | 1,423 | 2,634
Lease liability payments | (325) | (335)
Issuance of common shares under share option plans | 8 | 29
Repurchase of common shares | (2,304) | (307)
Distributions relating to non-controlling interest | (9) | (10)
Dividends paid on common shares | (1,550) | (1,670)
Cash flow (used in) provided by financing activities | (7,464) | 1,786
Increase (Decrease) in Cash and Cash Equivalents | 323 | (63)
Effect of foreign exchange on cash and cash equivalents | (3) | (12)
Cash and cash equivalents at beginning of year | 1,885 | 1,960
Cash and Cash Equivalents at End of Year | 2,205 | 1,885
Supplementary Cash Flow Information |  |
Interest paid | 980 | 1,028
Income taxes paid | $ (532) | $ 695

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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
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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
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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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