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Related parties - Transactions with related parties (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Transactions with related parties      
Net operating revenue $ 797 $ 872 $ 868
Cost and operating expenses (976) (1,781) (2,308)
Financial result (20) 19  
Joint Ventures      
Transactions with related parties      
Net operating revenue 372 374 352
Cost and operating expenses (951) (1,749) (2,269)
Financial result 27 49 115
Associates      
Transactions with related parties      
Net operating revenue 240 294 309
Cost and operating expenses (25) (32) (39)
Financial result 2 (1)  
Major Stockholders      
Transactions with related parties      
Net operating revenue 185 204 207
Financial result $ (49) $ (29) $ (115)