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Additional disclosure items G.3.2. Tax related risks and uncertain tax position (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Uncertain tax positions, remote risk 20.00%  
Uncertain tax positions, probable risk 50.00%  
Provision for taxes other than income tax    
Disclosure of other provisions [line items]    
Other provisions $ 47 $ 53
Tax contingent liability    
Disclosure of other provisions [line items]    
Estimated financial effect of contingent liabilities 254 313
Joint ventures | Provision for taxes other than income tax    
Disclosure of other provisions [line items]    
Other provisions 2 2
Joint ventures | Tax contingent liability    
Disclosure of other provisions [line items]    
Estimated financial effect of contingent liabilities $ 29 $ 38
Bottom of range    
Disclosure of other provisions [line items]    
Uncertain tax positions, possible risk 21.00%  
Top of range    
Disclosure of other provisions [line items]    
Uncertain tax positions, possible risk 49.00%