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Equity accounted investment - continuity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]      
Net investment beginning $ 1,487 $ 2,862  
Net income/(loss) from equity accounted investments 53 164 $ 291
Acqusitions and increase in paid in capital 995 188  
Dividends and other distributions (141) (273)  
Other comprehensive income / (loss) 21 (10)  
Divestments, derecognition and decrease in paid in capital (147) (1,444)  
Net investment ending 2,270 1,487 $ 2,862
Included in equity accounted investments [member]      
Disclosure of associates [line items]      
Net investment beginning 1,441    
Net investment ending 2,262 1,441  
Other long-term receivable in equity accounted investments [member]      
Disclosure of associates [line items]      
Net investment beginning 46    
Net investment ending 8 $ 46  
Other equity accounted investments [Member]      
Disclosure of associates [line items]      
Net investment ending $ 600