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Employee benefits - Underfunded pension plans, Measurement of plan assets at fair value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Overfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year $ 3,969  
Assets as at end of the year 3,752 $ 3,969
Level 3    
Measurement of plan assets    
Return on plan assets (7)  
Level 3 | Underfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 437 435
Return on plan assets 11  
Assets purchases 67 20
Assets sold during the year (109) (33)
Translation adjustment   15
Assets as at end of the year 406 437
Level 3 | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets 11 38
Assets purchases 71 129
Assets sold during the year (113) (170)
Translation adjustment (34) (143)
Private equity funds | Level 3 | Underfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 250 212
Return on plan assets 11 1
Assets purchases 28 20
Assets sold during the year (108) (33)
Translation adjustment   50
Assets as at end of the year 181 250
Private equity funds | Level 3 | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets 10 18
Assets purchases   1
Assets sold during the year (25) (15)
Translation adjustment (8) (35)
Real estate funds | Level 3 | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets   (8)
Assets purchases   1
Translation adjustment   (5)
Real estate | Level 3 | Underfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 5 55
Return on plan assets   (1)
Assets sold during the year (1)  
Translation adjustment (1) (49)
Assets as at end of the year 3 5
Real estate | Level 3 | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets (15) 9
Assets purchases 4 10
Assets sold during the year (14) (14)
Translation adjustment (18) (73)
Loans to participants | Level 3 | Underfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 2 3
Translation adjustment (1) (1)
Assets as at end of the year 1 2
Loans to participants | Level 3 | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets 16 19
Assets purchases 67 117
Assets sold during the year (74) (141)
Translation adjustment (8) (30)
Others | Level 3 | Underfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 180 165
Return on plan assets (14)  
Translation adjustment 2 15
Assets as at end of the year 168 $ 180
Equity pool | Overfunded pension plans    
Measurement of plan assets    
Return on plan assets 14  
Assets purchases 39  
Assets as at end of the year $ 53