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Employee benefits - Overfunded pension plans - Measurement of 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 $ 5,166  
Assets as at end of the year 5,301 $ 5,166
Overfunded pension plans | Equity pool    
Measurement of plan assets    
Return on plan assets 14  
Assets purchases 39  
Level 3    
Measurement of plan assets    
Return on plan assets (7)  
Level 3 | Overfunded pension plans    
Measurement of plan assets    
Assets as at beginning of the year 491 637
Return on plan assets 11 38
Assets purchases 71 129
Assets sold during the year (113) (170)
Translation adjustment (34) (143)
Assets as at end of the year 426 491
Level 3 | Overfunded pension plans | Private equity funds    
Measurement of plan assets    
Assets as at beginning of the year 126 157
Return on plan assets 10 18
Assets purchases   1
Assets sold during the year (25) (15)
Translation adjustment (8) (35)
Assets as at end of the year 103 126
Level 3 | Overfunded pension plans | Real estate funds    
Measurement of plan assets    
Assets as at beginning of the year 5 17
Return on plan assets   (8)
Assets purchases   1
Translation adjustment   (5)
Assets as at end of the year 5 5
Level 3 | Overfunded pension plans | Real estate    
Measurement of plan assets    
Assets as at beginning of the year 255 323
Return on plan assets (15) 9
Assets purchases 4 10
Assets sold during the year (14) (14)
Translation adjustment (18) (73)
Assets as at end of the year 212 255
Level 3 | Overfunded pension plans | Loans to participants    
Measurement of plan assets    
Assets as at beginning of the year 105 140
Return on plan assets 16 19
Assets purchases 67 117
Assets sold during the year (74) (141)
Translation adjustment (8) (30)
Assets as at end of the year $ 106 $ 105