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Employee benefits - Underfunded pension plans, Measurement of plan assets at fair value (Details) - Level 3 - Underfunded pension plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Measurement of plan assets    
Assets as at beginning of the year $ 435 $ 432
Return on plan assets   20
Assets purchases 20 18
Assets sold during the year (33) (37)
Translation adjustment 15 2
Assets as at end of the year 437 435
Private equity funds    
Measurement of plan assets    
Assets as at beginning of the year 212 213
Return on plan assets 1 11
Assets purchases 20 18
Assets sold during the year (33) (32)
Translation adjustment 50 2
Assets as at end of the year 250 212
Real estate funds    
Measurement of plan assets    
Assets as at beginning of the year 55 51
Return on plan assets (1) 4
Translation adjustment (49)  
Assets as at end of the year 5 55
Loans to participants    
Measurement of plan assets    
Assets as at beginning of the year 3 3
Assets sold during the year   (1)
Translation adjustment (1) 1
Assets as at end of the year 2 3
Others    
Measurement of plan assets    
Assets as at beginning of the year 165 165
Return on plan assets   5
Assets sold during the year   (4)
Translation adjustment 15 (1)
Assets as at end of the year $ 180 $ 165