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Performance B.4.2. Pension and other long-term employee benefit plans (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
year
Dec. 31, 2017
USD ($)
year
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 $ 60 $ 66
Estimate of contributions expected to be paid to plan in future years $ 111 $ 87
Weighted average duration of defined benefit obligation | year 7 7
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