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Summary Of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2017
Oil sands upgraders, extraction plants and mine facilities | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 20 years
Oil sands upgraders, extraction plants and mine facilities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Oil sands mine equipment | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 5 years
Oil sands mine equipment | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 15 years
Oil sands in situ processing facilities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 30 years
Power generation and utility plants | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 30 years
Power generation and utility plants | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Refineries and other processing plants | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 20 years
Refineries and other processing plants | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Marketing and other distribution assets | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 10 years
Marketing and other distribution assets | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 40 years
Inspection, overhaul and turnaround activities | Minimum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 2 years
Inspection, overhaul and turnaround activities | Maximum |
Disclosure of detailed information about property, plant and equipment [line items] |
Property, Plant and Equipment, Useful Life | 5 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The useful lives used for property, plant and equipment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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