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Period End Capitalized Suspended Exploratory Well Costs (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |  |  |
Capitalized suspended exploratory well costs, total |  |  | $ 143 |  |  |
Beginning Balance |  |  | 143 |  |  |
Additions pending the determination of proved reserves |  |  |  |  |  |
Charged to expense |  |  | (143) |  |  |
Reclassification to wells, facilities and equipment based on the determination of proved reserves |  |  |  |  |  |
Ending Balance |  |  |  |  |  |
Capitalized for a period of one year or less |  |  |  |  |  |
Capitalized For Period Of Between One And Ten Years |  |  |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |  |  |
Capitalized suspended exploratory well costs |  |  |  |  |  |
Capitalized For A Period Of Greater Than One Year |  |  |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |  |  |
Capitalized suspended exploratory well costs |  |  |  |  |  |

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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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