v3.22.4
Financial instruments and management of financial risks - Market risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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%
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 $ 8 $ 14 $ 9
Comprehensive income sensitivity to increase in risk variable 8 14 9
Net income sensitivity to decrease in risk variable (8) (14) (9)
Comprehensive income sensitivity to decrease in risk variable $ (8) $ (14) $ (9)
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 $ 14 $ 11 $ 4
Other comprehensive income sensitivity to increase in risk variable (44) (36) (38)
Comprehensive income sensitivity to increase in risk variable (30) (25) (34)
Net income sensitivity to decrease in risk variable (14) (11) (4)
Other comprehensive income sensitivity to decrease in risk variable 44 36 38
Comprehensive income sensitivity to decrease in risk variable $ 30 $ 25 $ 34
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 $ (2) $ (1) $ (1)
Comprehensive income sensitivity to increase in risk variable (2) (1) (1)
Net income sensitivity to decrease in risk variable 2 1 1
Comprehensive income sensitivity to decrease in risk variable 2 1 1
U.S dollars | Interest rate risk      
Market risks      
Net income sensitivity to increase in risk variable (1) (2) (4)
Other comprehensive income sensitivity to increase in risk variable 0 0 1
Comprehensive income sensitivity to increase in risk variable (1) (2) (3)
Net income sensitivity to decrease in risk variable 1 2 4
Other comprehensive income sensitivity to decrease in risk variable 0 0 (1)
Comprehensive income sensitivity to decrease in risk variable $ 1 $ 2 $ 3
Common shares | Other market risk      
Market risks      
Percentage of reasonably possible increase in market risk variable 25.00% 25.00% 25.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 25.00% 25.00% 25.00%
Net income sensitivity to increase in risk variable $ 0 $ (5) $ (4)
Comprehensive income sensitivity to increase in risk variable 0 (5) (4)
Net income sensitivity to decrease in risk variable 0 5 4
Comprehensive income sensitivity to decrease in risk variable $ 0 $ 5 $ 4