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share-based compensation - Restricted stock units (Details) | 12 Months Ended |  |
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Dec. 31, 2018 EquityInstruments shares | Dec. 31, 2017 EquityInstruments | Dec. 31, 2016 EquityInstruments
Restricted stock units |  |  |
share-based compensation |  |  |
Nominal value (in number of equity shares) | shares | 1 |  |
Typical vesting period | 33 months |  |
TELUS Corporation restricted stock units |  |  |
share-based compensation |  |  |
Outstanding | 3,660,437 | 3,945,273 |
Restricted stock units with performance condition | Maximum |  |  |
share-based compensation |  |  |
Variable payout (as a percent) | 200.00% |  |
Restricted stock units with performance condition | Minimum |  |  |
share-based compensation |  |  |
Variable payout (as a percent) | 0.00% |  |
Restricted stock units with total customer connections performance condition |  |  |
share-based compensation |  |  |
Total customer connection payout weight (as a per cent) | 25.00% |  |
Outstanding | 155,639 | 154,452 |
Restricted stock units with relative total shareholder return performance condition |  |  |
share-based compensation |  |  |
Relative total shareholder return payout weight (as a per cent) | 75.00% |  |
Outstanding | 466,917 | 463,357 |
Restricted stock units with only service conditions |  |  |
share-based compensation |  |  |
Outstanding | 3,037,881 | 3,327,464 |
Restricted stock units without market performance conditions |  |  |
share-based compensation |  |  |
Outstanding | 3,193,520 | 3,481,916 | 3,390,979

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