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Credit Facilities - Additional Information (Details) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Outstanding letters of credit |  | $ 15,000,000.0 | $ 15,200,000
Revolving Facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity | $ 575,000,000 |  |
Term Loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity |  | $ 300,000,000 |
Operating loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity | 50,000,000 |  |
Syndicated loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity | 325,000,000 |  |
Subsidiary syndicated loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity | $ 200,000,000 |  |

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- Definition Letters Of Credit Outstanding, Amount + References No definition available. + Details
Name: | bte_LettersOfCreditOutstandingAmount1
Namespace Prefix: | bte_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Maximum Borrowing Capacity1 + References No definition available. + Details
Name: | bte_LineofCreditFacilityMaximumBorrowingCapacity1
Namespace Prefix: | bte_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=bte_RevolvingCreditFacility1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=bte_NonRevolvingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=bte_RevolvingCreditFacilityOperatingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=bte_RevolvingCreditFacilitySyndicatedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=bte_RevolvingCreditFacilitySubsidiarySyndicatedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |