XML 101 R95.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Additional disclosure items G.3.2. Tax related risks and uncertain tax position (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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 $ 50 $ 44
Tax contingent liability    
Disclosure of other provisions [line items]    
Estimated financial effect of contingent liabilities 300 226
Joint ventures | Provision for taxes other than income tax    
Disclosure of other provisions [line items]    
Other provisions 4 2
Joint ventures | Tax contingent liability    
Disclosure of other provisions [line items]    
Estimated financial effect of contingent liabilities $ 49 $ 29
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%