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Financial and other non-current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [abstract]    
Non-current financial assets, equity investments $ 1,577 $ 1,524
Non-current financial asstets debt securities 36 33
Non-current financial assets, fund investments 366 233
Noncurrent financial assets, total financial investments 1,979 1,790
Long term receivables from finance subleases 83 66
Other long-term receivables 125 104
Contingent consideration receivables 625 399
Long-term loans, advances and security deposits 89 159
Total financial assets $ 2,901 $ 2,518