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Share-Based Compensation Plans (Details) - Schedule of stock options that are exercisable and the weighted average remaining life - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Schedule of stock options that are exercisable and the weighted average remaining life [Abstract] |  |
Telesat Canada time vesting options |  | 5,779,565
Telesat Canada performance vesting options |  | 406,266
Telesat Corporation time vesting options | 875,880 |
Weighted average remaining life | 2 years | 6 years

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- Definition The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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

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- Definition Telesat Corporation time vesting options + References No definition available. + Details
Name: | tsat_TelesatCorporationTimeVestingOptions
Namespace Prefix: | tsat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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