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share-based compensation - Restricted share units (Details) - EquityInstruments | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Jun. 30, 2024
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TELUS Corporation restricted share units |  |  |  |  |
share-based compensation |  |  |  |  |
Outstanding - Non-vested | 23,760,493 |  | 14,691,643 |  |
Restricted share units without market performance conditions |  |  |  |  |
share-based compensation |  |  |  |  |
Outstanding - Non-vested | 21,593,850 | 14,205,590 | 13,361,320 |  |
Restricted share units with only service conditions |  |  |  |  |
share-based compensation |  |  |  |  |
Outstanding - Non-vested | 18,985,982 |  | 12,212,381 |  |
Notional subset affected by relative total shareholder return performance condition |  |  |  |  |
share-based compensation |  |  |  |  |
Total customer connection payout weight (as a percent) |  |  |  | 33.33% |
Relative total shareholder return payout weight (as a percent) |  |  |  |  | 75.00%
Outstanding - Non-vested | 2,166,643 |  | 1,330,323 |  |
Restricted share units with total customer connections performance condition |  |  |  |  |
share-based compensation |  |  |  |  |
Total customer connection payout weight (as a percent) |  |  |  | 3.00% | 25.00%
Cash flow performance condition payout weight (as a percent) |  |  |  | 33.33% | 0.00%
Outstanding - Non-vested | 2,607,868 |  | 1,148,939 |  |
Restricted share units with total customer connections performance condition | Maximum |  |  |  |  |
share-based compensation |  |  |  |  |
Variable payout (as a percent) | 200.00% |  |  |  |
Restricted share units with total customer connections performance condition | Minimum |  |  |  |  |
share-based compensation |  |  |  |  |
Variable payout (as a percent) | 0.00% |  |  |  |

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