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Performance B.4.2. Pension and other long-term employee benefit plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Long-Service Plans    
Disclosure of defined benefit plans [line items]    
Requisite service period 5 years  
Termination Plans    
Disclosure of defined benefit plans [line items]    
Net defined benefit liability $ 59 $ 60
Estimate of contributions expected to be paid to plan in future years $ 106 $ 111
Weighted average duration of defined benefit obligation 6 years 7 years
Bottom of range | Long-Service Plans    
Disclosure of defined benefit plans [line items]    
Requisite service period, additional bonus 5 years  
Top of range | Long-Service Plans    
Disclosure of defined benefit plans [line items]    
Requisite service period, additional bonus 40 years