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SEGMENTED INFORMATION (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 28, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Revenues and Other Income |  |  |
Less : Royalties |  | $ (1,522.0) | $ (1,050.0)
Operating revenues, net of royalties |  | 38,344.0 | 38,542.0
Other income (loss) |  | 645.0 | 444.0
Total revenue |  | 38,989.0 | 38,986.0
Expenses |  |  |
Purchases of crude oil and products |  | 12,562.0 | 14,133.0
Operating, selling and general |  | 11,244.0 | 10,573.0
Transportation |  | 1,442.0 | 1,319.0
Depreciation, depletion, amortization and impairment |  | 10,572.0 | 5,738.0
Exploration |  | 256.0 | 122.0
(Gain) loss on asset exchange and disposal of assets |  | (253.0) | (24.0)
Financing expenses |  | 633.0 | 2,142.0
Total expenses |  | 36,456.0 | 34,003.0
(Loss) earnings before Income Taxes |  | 2,533.0 | 4,983.0
Income Tax Expense (Recovery) |  |  |
Current |  | 1,552.0 | 1,250.0
Deferred |  | (1,918.0) | 440.0
Total income tax (recovery) expense |  | (366.0) | 1,690.0
Net (Loss) Earnings |  | 2,899.0 | 3,293.0
Capital and exploration expenditures |  | 5,558.0 | 5,406.0
Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 39,866.0 | 39,592.0
Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | (4,487.0) | (3,827.0)
Corporate Energy Trading And Eliminations |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 27.0 | 29.0
Operating revenues, net of royalties |  | (4,460.0) | (3,798.0)
Other income (loss) |  | (32.0) | 57.0
Total revenue |  | (4,492.0) | (3,741.0)
Expenses |  |  |
Purchases of crude oil and products |  | (4,141.0) | (4,086.0)
Operating, selling and general |  | 519.0 | 446.0
Transportation |  | (51.0) | (57.0)
Depreciation, depletion, amortization and impairment |  | 74.0 | 63.0
Financing expenses |  | 187.0 | 1,769.0
Total expenses |  | (3,412.0) | (1,865.0)
(Loss) earnings before Income Taxes |  | (1,080.0) | (1,876.0)
Income Tax Expense (Recovery) |  |  |
Current |  | (312.0) | (392.0)
Deferred |  | (89.0) | 129.0
Total income tax (recovery) expense |  | (401.0) | (263.0)
Net (Loss) Earnings |  | (679.0) | (1,613.0)
Capital and exploration expenditures |  | 148.0 | 58.0
Oil Sands |  |  |
Revenues and Other Income |  |  |
Less : Royalties |  | (917.0) | (398.0)
Operating revenues, net of royalties |  | 17,430.0 | 15,345.0
Other income (loss) |  | 172.0 | 387.0
Total revenue |  | 17,602.0 | 15,732.0
Expenses |  |  |
Purchases of crude oil and products |  | 1,407.0 | 1,563.0
Operating, selling and general |  | 8,027.0 | 7,577.0
Transportation |  | 1,293.0 | 1,144.0
Depreciation, depletion, amortization and impairment |  | 8,170.0 | 4,024.0
Exploration |  | 127.0 | 44.0
(Gain) loss on asset exchange and disposal of assets |  | (14.0) | (108.0)
Financing expenses |  | 318.0 | 320.0
Total expenses |  | 19,328.0 | 14,564.0
(Loss) earnings before Income Taxes |  | (1,726.0) | 1,168.0
Income Tax Expense (Recovery) |  |  |
Current |  | 266.0 | (128.0)
Deferred |  | (1,565.0) | 351.0
Total income tax (recovery) expense |  | (1,299.0) | 223.0
Net (Loss) Earnings |  | (427.0) | 945.0
Capital and exploration expenditures |  | 3,522.0 | 3,546.0
Oil Sands | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 13,948.0 | 12,039.0
Oil Sands | Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 4,399.0 | 3,704.0
Exploration and Production |  |  |
Revenues and Other Income |  |  |
Less : Royalties |  | (605.0) | (652.0)
Operating revenues, net of royalties |  | 3,070.0 | 3,217.0
Other income (loss) |  | 430.0 | (68.0)
Total revenue |  | 3,500.0 | 3,149.0
Expenses |  |  |
Operating, selling and general |  | 525.0 | 507.0
Transportation |  | 80.0 | 85.0
Depreciation, depletion, amortization and impairment |  | 1,505.0 | 967.0
Exploration |  | 129.0 | 78.0
(Gain) loss on asset exchange and disposal of assets |  | (228.0) | 91.0
Financing expenses |  | 73.0 | 46.0
Total expenses |  | 2,084.0 | 1,774.0
(Loss) earnings before Income Taxes |  | 1,416.0 | 1,375.0
Income Tax Expense (Recovery) |  |  |
Current |  | 626.0 | 680.0
Deferred |  | (215.0) | (112.0)
Total income tax (recovery) expense |  | 411.0 | 568.0
Net (Loss) Earnings |  | 1,005.0 | 807.0
Capital and exploration expenditures |  | 1,070.0 | 946.0
Exploration and Production | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 3,675.0 | 3,869.0
Refining and Marketing |  |  |
Revenues and Other Income |  |  |
Operating revenues, net of royalties |  | 22,304.0 | 23,778.0
Other income (loss) |  | 75.0 | 68.0
Total revenue |  | 22,379.0 | 23,846.0
Expenses |  |  |
Purchases of crude oil and products |  | 15,296.0 | 16,656.0
Operating, selling and general |  | 2,173.0 | 2,043.0
Transportation |  | 120.0 | 147.0
Depreciation, depletion, amortization and impairment |  | 823.0 | 684.0
(Gain) loss on asset exchange and disposal of assets |  | (11.0) | (7.0)
Financing expenses |  | 55.0 | 7.0
Total expenses |  | 18,456.0 | 19,530.0
(Loss) earnings before Income Taxes |  | 3,923.0 | 4,316.0
Income Tax Expense (Recovery) |  |  |
Current |  | 972.0 | 1,090.0
Deferred |  | (49.0) | 72.0
Total income tax (recovery) expense |  | 923.0 | 1,162.0
Net (Loss) Earnings |  | 3,000.0 | 3,154.0
Capital and exploration expenditures |  | 818.0 | 856.0
Refining and Marketing | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | 22,216.0 | 23,655.0
Refining and Marketing | Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues |  | $ 88.0 | $ 123.0
Canbriam Energy, Inc. | Exploration and Production |  |  |
Expenses |  |  |
(Gain) loss on asset exchange and disposal of assets | $ (151.0) |  |

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- Definition The amount of expense related to operating, selling, general and administrative. + References No definition available. + Details
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of operating income (loss) that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
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Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |