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Equity accounted investment - continuity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]      
Net investment beginning $ 2,270 $ 1,487  
Net income/(loss) from equity accounted investments 259 53 $ 164
Acqusitions and increase in paid in capital 475 995  
Dividends and other distributions (230) (141)  
Other comprehensive income / (loss) (58) 21  
Divestments, derecognition and decrease in paid in capital (31) (147)  
Net investment ending 2,686 2,270 1,487
Equity accounted investments 2,686 2,262 $ 1,442
Other equity accounted investments [Member]      
Disclosure of associates [line items]      
Net investment ending 750    
Other long-term receivable in equity accounted investments 0 $ 8  
Several investments [Member] | Maximum [member]      
Disclosure of associates [line items]      
Equity accounted investments $ 750