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Share-based payments (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Payment Arrangements [Abstract]  
Explanation of effect of share-based payments on entity's profit or loss
The following share-based payment amounts are included in the income statements as operating costs.
THREE MONTHS SIX MONTHS
FOR THE PERIOD ENDED JUNE 30 2022 2021 2022 2021
Employee savings plan (6) (8) (14) (16)
Restricted share units (RSUs) and performance share units (PSUs) (21) (13) (46) (33)
Other (1)
 (2) (1) (3) (3)
Total share-based payments (29) (22) (63) (52)
(1) Includes deferred share units and stock options.
Disclosure of number and weighted average exercise prices of other equity instruments
RSUs/PSUs
NUMBER OF RSUs/PSUs
Outstanding, January 1, 2022 3,085,667 
Granted 1,005,712 
Dividends credited 79,276 
Settled (1,031,426)
Forfeited (52,717)
Outstanding, June 30, 2022 3,086,512 
Disclosure of number and weighted average exercise prices of share options
STOCK OPTIONS
NUMBER OF OPTIONS WEIGHTED AVERAGE EXERCISE PRICE ($)
Outstanding, January 1, 2022 10,778,724  60 
Exercised(1)
 (2,910,716) 58 
Forfeited or expired (23,624) 65 
Outstanding, June 30, 2022 7,844,384  61 
Exercisable, June 30, 2022 4,581,464  58 
(1)The weighted average market share price for options exercised during the six months ended June 30, 2022 was $69.