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Long term debt - Schedules (Narrative) (Details) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
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Revolving Credit Facilities [Abstract] |  |
Gross Unsecured Revolving Credit Facility Available | $ 1,000,000,000 |
Maximum Letters of credit under the facility | 100,000,000 |
Increase in revolving credit facility with minimum Increments | 50,000,000 |
Maximum unsecured revolving credit facility | 1,250,000,000 |
Unsecured loans received | 0 |
Outstanding letters of credit facility | 1,528,603,000 | $ 1,572,984,000
Gross Letters Of Credit Committments | $ 1,719,120,000 | $ 1,716,473,000
Debt to tangible net worth ratio | 1 |

X
- Definition Gross amount of letters of credit commitments. + References No definition available. + Details
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Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross amount of unsecured credit loan facility available. + References No definition available. + Details
Name: | ccj_GrossUnsecuredRevolvingCreditFacilityAvailable
Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letters of credit amount outstanding at a given period. + References No definition available. + Details
Name: | ccj_LettersOfCreditOustanding
Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum amount of letters of credit available under the credit facility. + References No definition available. + Details
Name: | ccj_MaximumAmountOfLettersOfCreditAvailableUnderCreditFacility
Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum amount of revolving credit facility available under the commitment. + References No definition available. + Details
Name: | ccj_MaximumUnsecuredRevolvingCreditFacilityAvailable
Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of increment that is allowed under the credit facility. + References No definition available. + Details
Name: | ccj_MinimumIncrementAmountOfCreditFacility
Namespace Prefix: | ccj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt to tangbile net worth ratio. + References No definition available. + Details
Name: | ccj_RatioOfDebtToTangibleNetWorth
Namespace Prefix: | ccj_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ccj_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of loans received from banks that have not been secured by collateral. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant