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long-term debt - TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities (Details)
$ in Millions
6 Months Ended 12 Months Ended 36 Months Ended
Jun. 30, 2024
USD ($)
item
Dec. 31, 2024
Jan. 03, 2028
Dec. 31, 2023
USD ($)
Lease liabilities        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Weighted average interest rate 5.80%      
TELUS International (Cda) Inc. credit facility        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Undrawn borrowing facilities $ 539     $ 492
Maximum aggregate amount of credit facility $ 1,925     1,955
Number of financial ratio tests | item 2      
Percentage of principal advance required to be repaid each year of the term of the agreement 5.00%      
TELUS International (Cda) Inc. credit facility | Minimum        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Operating cash flow to debt service ratio 1.50      
TELUS International (Cda) Inc. credit facility | Maximum        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Leverage ratio   3.75 3.25  
TELUS International (Cda) Inc. credit facility | Foreign exchange derivative        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Amortizing amount, convertible $ 419      
Fixed interest rate 2.60%      
TELUS International (Cda) Inc. credit facility | Foreign exchange derivative | U.S. Dollars        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Derivative Exchange Rate 1.088      
TELUS International (Cda) Inc. credit facility | Foreign exchange derivative | European euro        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Derivative Exchange Rate 1.00      
Revolving component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Undrawn borrowing facilities $ 539     492
Maximum aggregate amount of credit facility $ 800     800
Weighted average interest rate 7.40%      
Term loan component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Maximum aggregate amount of credit facility $ 1,125     1,155
Other        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Fixed interest rate 4.40%      
Other lenders | TELUS International (Cda) Inc. credit facility        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding $ 1,286     1,358
Other lenders | Revolving component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding 242     286
Other lenders | Term loan component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding 1,044     1,072
TELUS Corporation | TELUS International (Cda) Inc. credit facility        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding 100     105
TELUS Corporation | Revolving component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding 19     22
Maximum aggregate amount of credit facility $ 800      
TELUS Corporation, share of lending, as a percent 7.20%      
TELUS Corporation | Term loan component        
TELUS International (Cda) Inc. credit facility, Other and Lease Liabilities        
Outstanding $ 81     $ 83
Maximum aggregate amount of credit facility $ 1,200