Employee future benefits (Details) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Defined contribution pension plans | ||||
| Matching contribution to employees' 5% contribution (in percent) | 100.00% | 100.00% | ||
| Defined benefit pension expense | $ 9 | $ 7 | $ 3 | |
| Obligation for defined benefit pension plans | 9 | 11 | $ 15 | |
| Pension plans | ||||
| Defined contribution pension plans | ||||
| Defined benefit pension expense | 0 | 1 | 1 | |
| TELUS Corporation (parent) | Pension plans | ||||
| Defined contribution pension plans | ||||
| Defined benefit pension expense | $ 2 | $ 1 | $ 0 | |