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Basis of preparation and significant accounting policies Basis of preparation and significant accounting policies (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items]          
Assets $ 2,751,273,000,000   $ 2,558,124,000,000    
Equity $ 200,874,000,000   194,249,000,000 $ 191,294,000,000 $ 196,224,000,000
Lease Term, Planning Horizon 5 years        
IFRS 16          
Disclosure of initial application of standards or interpretations [line items]          
Assets   $ 5,000,000,000      
Financial liabilities   5,000,000,000      
Net assets   0      
Retained earnings          
Disclosure of initial application of standards or interpretations [line items]          
Equity $ 142,593,000,000   $ 138,191,000,000 $ 140,908,000,000 $ 139,414,000,000
Retained earnings | IFRS 16          
Disclosure of initial application of standards or interpretations [line items]          
Equity   $ 0