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Investments in associates and joint ventures - Changes during the year (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investments in associates and joint ventures          
Balance at the beginning     $ 2,031 $ 2,798  
Capital contribution to CSP     42 75  
Additions     42 75  
Translation adjustment     70 (645)  
Equity results in income statement $ 105 $ 43 77 (67)  
Equity results in statement of comprehensive income       (2)  
Dividends declared     (49) (100)  
Others     26 12  
Balance at the end 2,197 $ 2,071 2,197 $ 2,071  
Notional amount $ 1,559   $ 1,559   $ 1,557