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Financial instruments and management of financial risks - Market risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Interest rate risk      
Market risks      
Basis point change of reasonably possible increase in unobservable input, liabilities 2500.00% 2500.00% 2500.00%
Basis point change of reasonably possible decrease in unobservable input, liabilities 2500.00% 2500.00% 2500.00%
European euros | Currency risk      
Market risks      
Percentage of reasonably possible increase in market risk variable 10.00% 10.00% 10.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 10.00% 10.00% 10.00%
Net income sensitivity to increase in risk variable $ 7 $ 7 $ 14
Other comprehensive income sensitivity to increase in risk variable (54) (41) (44)
Comprehensive income sensitivity to increase in risk variable (47) (34) (30)
Net income sensitivity to decrease in risk variable (7) (7) (14)
Other comprehensive income sensitivity to decrease in risk variable 48 41 44
Comprehensive income sensitivity to decrease in risk variable $ 41 $ 34 $ 30
Philippine peso | Currency risk      
Market risks      
Percentage of reasonably possible increase in market risk variable 10.00% 10.00% 10.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 10.00% 10.00% 10.00%
Net income sensitivity to increase in risk variable $ (4) $ (3) $ (2)
Other comprehensive income sensitivity to increase in risk variable 0 0 0
Comprehensive income sensitivity to increase in risk variable (4) (3) (2)
Net income sensitivity to decrease in risk variable 4 3 2
Other comprehensive income sensitivity to decrease in risk variable 0 0 0
Comprehensive income sensitivity to decrease in risk variable $ 4 $ 3 $ 2
Canadian Dollars | Currency risk      
Market risks      
Percentage of reasonably possible increase in market risk variable 10.00% 10.00% 10.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 10.00% 10.00% 10.00%
Net income sensitivity to increase in risk variable $ 16 $ 10 $ 8
Other comprehensive income sensitivity to increase in risk variable 0 0 0
Comprehensive income sensitivity to increase in risk variable 16 10 8
Net income sensitivity to decrease in risk variable (22) (12) (8)
Other comprehensive income sensitivity to decrease in risk variable 0 0 0
Comprehensive income sensitivity to decrease in risk variable (22) (12) (8)
U.S dollars | Interest rate risk      
Market risks      
Net income sensitivity to increase in risk variable (3) (3) (1)
Other comprehensive income sensitivity to increase in risk variable 0 0 0
Comprehensive income sensitivity to increase in risk variable (3) (3) (1)
Net income sensitivity to decrease in risk variable 3 3 1
Other comprehensive income sensitivity to decrease in risk variable 0 0 0
Comprehensive income sensitivity to decrease in risk variable $ 3 $ 3 $ 1