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Segmented Information (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 23, 2018
Revenues and Other Income |  |  |
Less : Royalties | $ (1,050.0) | $ (931.0) |
Operating revenues, net of royalties | 38,542.0 | 31,954.0 |
Other income (loss) | 444.0 | 125.0 |
Total revenue | 38,986.0 | 32,079.0 |
Expenses |  |  |
Purchases of crude oil and products | 14,133.0 | 11,121.0 |
Operating, selling and general | 10,573.0 | 9,188.0 |
Transportation | 1,319.0 | 997.0 |
Depreciation, depletion, amortization and impairment | 5,738.0 | 5,601.0 |
Exploration | 122.0 | 104.0 |
(Gain) loss on asset exchange and disposal of assets | (24.0) | (602.0) |
Financing expenses (income) | 2,142.0 | (246.0) |
Total expenses | 34,003.0 | 26,163.0 |
Earnings before Income Taxes | 4,983.0 | 5,916.0 |
Income Tax Expense (Recovery) |  |  |
Current | 1,250.0 | 1,209.0 |
Deferred income tax expense (recovery) | 440.0 | 249.0 |
Total tax expense (income) | 1,690.0 | 1,458.0 |
Net Earnings (Loss) | 3,293.0 | 4,458.0 |
Capital and exploration expenditures | 5,406.0 | 6,551.0 |
Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues | 39,592.0 | 32,885.0 |
Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues | (3,773.0) | (3,643.0) |
Corporate Energy Trading And Eliminations |  |  |
Revenues and Other Income |  |  |
Gross revenues | 29.0 | 63.0 |
Operating revenues, net of royalties | (3,744.0) | (3,580.0) |
Other income (loss) | 206.0 | (20.0) |
Total revenue | (3,538.0) | (3,600.0) |
Expenses |  |  |
Purchases of crude oil and products | (4,086.0) | (3,513.0) |
Operating, selling and general | 521.0 | 559.0 |
Transportation | (47.0) | (26.0) |
Depreciation, depletion, amortization and impairment | 64.0 | 106.0 |
(Gain) loss on asset exchange and disposal of assets |  | (97.0) |
Financing expenses (income) | 1,769.0 | (477.0) |
Total expenses | (1,779.0) | (3,448.0) |
Earnings before Income Taxes | (1,759.0) | (152.0) |
Income Tax Expense (Recovery) |  |  |
Current | (400.0) | (541.0) |
Deferred income tax expense (recovery) | 162.0 | 330.0 |
Total tax expense (income) | (238.0) | (211.0) |
Net Earnings (Loss) | (1,521.0) | 59.0 |
Capital and exploration expenditures | 58.0 | 34.0 |
Oil Sands |  |  |
Revenues and Other Income |  |  |
Less : Royalties | (398.0) | (355.0) |
Operating revenues, net of royalties | 15,345.0 | 12,919.0 |
Other income (loss) | 288.0 | 86.0 |
Total revenue | 15,633.0 | 13,005.0 |
Expenses |  |  |
Purchases of crude oil and products | 1,563.0 | 623.0 |
Operating, selling and general | 7,570.0 | 6,257.0 |
Transportation | 1,144.0 | 827.0 |
Depreciation, depletion, amortization and impairment | 4,024.0 | 3,782.0 |
Exploration | 44.0 | 15.0 |
(Gain) loss on asset exchange and disposal of assets | (108.0) | (50.0) |
Financing expenses (income) | 320.0 | 180.0 |
Total expenses | 14,557.0 | 11,634.0 |
Earnings before Income Taxes | 1,076.0 | 1,371.0 |
Income Tax Expense (Recovery) |  |  |
Current | (128.0) | 192.0 |
Deferred income tax expense (recovery) | 351.0 | 170.0 |
Total tax expense (income) | 223.0 | 362.0 |
Net Earnings (Loss) | 853.0 | 1,009.0 |
Capital and exploration expenditures | 3,546.0 | 5,059.0 |
Oil Sands | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues | 12,039.0 | 9,723.0 |
Oil Sands | Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues | 3,704.0 | 3,551.0 |
Exploration and Production |  |  |
Revenues and Other Income |  |  |
Less : Royalties | (652.0) | (576.0) |
Operating revenues, net of royalties | 3,217.0 | 2,911.0 |
Other income (loss) | (71.0) | (14.0) |
Total revenue | 3,146.0 | 2,897.0 |
Expenses |  |  |
Operating, selling and general | 503.0 | 422.0 |
Transportation | 85.0 | 86.0 |
Depreciation, depletion, amortization and impairment | 967.0 | 1,028.0 |
Exploration | 78.0 | 89.0 |
(Gain) loss on asset exchange and disposal of assets | 91.0 |  |
Financing expenses (income) | 46.0 | 36.0 |
Total expenses | 1,770.0 | 1,661.0 |
Earnings before Income Taxes | 1,376.0 | 1,236.0 |
Income Tax Expense (Recovery) |  |  |
Current | 680.0 | 617.0 |
Deferred income tax expense (recovery) | (112.0) | (113.0) |
Total tax expense (income) | 568.0 | 504.0 |
Net Earnings (Loss) | 808.0 | 732.0 |
Capital and exploration expenditures | 946.0 | 824.0 |
Exploration and Production | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues | 3,869.0 | 3,487.0 |
Refining and Marketing |  |  |
Revenues and Other Income |  |  |
Operating revenues, net of royalties | 23,724.0 | 19,704.0 |
Other income (loss) | 21.0 | 73.0 |
Total revenue | 23,745.0 | 19,777.0 |
Expenses |  |  |
Purchases of crude oil and products | 16,656.0 | 14,011.0 |
Operating, selling and general | 1,979.0 | 1,950.0 |
Transportation | 137.0 | 110.0 |
Depreciation, depletion, amortization and impairment | 683.0 | 685.0 |
(Gain) loss on asset exchange and disposal of assets | (7.0) | (455.0) |
Financing expenses (income) | 7.0 | 15.0 |
Total expenses | 19,455.0 | 16,316.0 |
Earnings before Income Taxes | 4,290.0 | 3,461.0 |
Income Tax Expense (Recovery) |  |  |
Current | 1,098.0 | 941.0 |
Deferred income tax expense (recovery) | 39.0 | (138.0) |
Total tax expense (income) | 1,137.0 | 803.0 |
Net Earnings (Loss) | 3,153.0 | 2,658.0 |
Capital and exploration expenditures | 856.0 | 634.0 |
Refining and Marketing | Operating segments |  |  |
Revenues and Other Income |  |  |
Gross revenues | 23,655.0 | 19,612.0 |
Refining and Marketing | Elimination of intersegment amounts |  |  |
Revenues and Other Income |  |  |
Gross revenues | $ 69.0 | $ 92.0 |
Canbriam Energy, Inc. |  |  |
Disclosure of operating segments [line items] |  |  |
Interest purchased (as a percent) |  |  | 37.00%

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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: |