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real estate joint ventures and investment in associate - Commitments and contingent liabilities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
real estate joint venture
Advances	$ 20,288	$ 18,474
Real estate joint ventures
real estate joint venture
Construction financing amount	342	342
Real estate joint ventures | TELUS Corporation Construction Credit Facility
real estate joint venture
Construction financing amount	114	114
Undrawn		10
Advances	114	104
Real estate joint ventures | Construction Credit Facility - Other
real estate joint venture
Construction financing amount	228	228
TELUS Sky real estate joint venture
real estate joint venture
Contractual capital commitments	$ 17	$ 37
Percentage of financing provided	33.333%
Construction financing amount	$ 342
TELUS Sky real estate joint venture | Three Canadian financial institutions
real estate joint venture
Percentage of financing provided	66.667%

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- Definition

The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

+ References

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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.

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- Definition

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+ References

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- Definition

The percentage of construction financing provided.

+ References

No definition available.

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