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Disclosure - financial instruments - Activity related to allowance for doubtful accounts (Details) link:presentationLink link:calculationLink link:definitionLink 40404 - Disclosure - financial instruments - Contract assets (Details) link:presentationLink link:calculationLink link:definitionLink 40406 - Disclosure - financial instruments - Market risks (Details) link:presentationLink link:calculationLink link:definitionLink 40407 - Disclosure - financial instruments - Fair values - General (Details) link:presentationLink link:calculationLink link:definitionLink 40408 - Disclosure - financial instruments - Fair Values Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 40409 - Disclosure - financial instruments - Significant unobservable inputs used in the fair value measurement (Details) link:presentationLink link:calculationLink link:definitionLink 40410 - Disclosure - financial instruments - Fair values Non-derivative (Details) link:presentationLink link:calculationLink link:definitionLink 40411 - Disclosure - financial instruments - Derivative gains and losses (Details) link:presentationLink link:calculationLink link:definitionLink 40502 - Disclosure - segment information - Income before income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - revenue from contracts with customers - Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - other comprehensive income (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - per share amounts (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - dividends per share (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - share-based compensation - Expense (Details) link:presentationLink link:calculationLink link:definitionLink 41402 - Disclosure - share-based compensation - Restricted share units (Details) link:presentationLink link:calculationLink link:definitionLink 41403 - 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Disclosure - intangible assets and goodwill - Impairment testing (Details) link:presentationLink link:calculationLink link:definitionLink 41901 - Disclosure - leases (Details) link:presentationLink link:calculationLink link:definitionLink 42101 - Disclosure - real estate joint ventures and investments in associates - Summarized financial information (Details) link:presentationLink link:calculationLink link:definitionLink 42102 - Disclosure - real estate joint ventures and investments in associates - Investment activity (Details) link:presentationLink link:calculationLink link:definitionLink 42103 - Disclosure - real estate joint ventures and investments in associates - Investments in associates (Details) link:presentationLink link:calculationLink link:definitionLink 42201 - Disclosure - short-term borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 42402 - Disclosure - advance billings and customer deposits - Contract liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 42602 - Disclosure - long-term debt - TELUS Corporation senior notes (Details) link:presentationLink link:calculationLink link:definitionLink 42603 - Disclosure - long-term debt - TELUS Corporation commercial paper (Details) link:presentationLink link:calculationLink link:definitionLink 42605 - Disclosure - long-term debt - TELUS Corporation - Other (unsecured) (Details) link:presentationLink link:calculationLink link:definitionLink 42606 - Disclosure - long-term debt - TELUS Corporation junior subordinated notes (Details) link:presentationLink link:calculationLink link:definitionLink 42607 - Disclosure - long-term debt - TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 42801 - Disclosure - owners' equity (Details) link:presentationLink link:calculationLink link:definitionLink 42802 - Disclosure - owners' equity - Subsidiaries with significant non-controlling interests (Details) link:presentationLink link:calculationLink link:definitionLink 42803 - Disclosure - owners' equity - Terrion (Details) link:presentationLink link:calculationLink link:definitionLink 42804 - Disclosure - owners' equity - Purchase of common shares for cancellation pursuant to normal course issuer bid (Details) link:presentationLink link:calculationLink link:definitionLink 43102 - Disclosure - additional statement of cash flow information - Financing activities (Details) link:presentationLink link:calculationLink link:definitionLink 10001 - Disclosure - notes to consolidated financial statements link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - condensed interim consolidated financial statements link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - accounting policy developments link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - capital structure financial policies link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - financial instruments link:presentationLink link:calculationLink link:definitionLink 10501 - 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