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Transaction (Details) - Telesat Canada [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Transaction (Details) [Line Items] |
PSP Investments payment | $ 7
Red Isle [Member] |
Transaction (Details) [Line Items] |
Value of its equity interests | $ 5

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- Definition The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 120 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_120_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_TransactionPriceAllocatedToRemainingPerformanceObligations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Investments payment. + References No definition available. + Details
Name: | tsat_InvestmentsPayment
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | ifrs-full_ConsolidatedStructuredEntitiesAxis=tsat_TelesatCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=tsat_RedIsleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |