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Related parties - Transactions with related parties (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2019
Transactions with related parties        
Net operating revenue $ 308 $ 180 $ 582 $ 342
Cost and operating expenses (156) (266) (338) (539)
Financial result 119 (3) (389) (3)
Joint Ventures        
Transactions with related parties        
Net operating revenue 180 68 341 137
Cost and operating expenses (152) (261) (329) (528)
Financial result (21) 8 (8) 29
Associates        
Transactions with related parties        
Net operating revenue 67 57 127 118
Cost and operating expenses (4) (5) (9) (11)
Financial result (1) 2 (1) 4
Stockholders        
Transactions with related parties        
Net operating revenue 61 55 114 87
Financial result $ 141 $ (13) $ (380) $ (36)