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Recoverable taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Recoverable taxes    
Value-added tax (net of provision for loss) $ 433 $ 484
Brazilian federal contributions 593 659
Prepaid income taxes 561 967
Others 13 16
Total 1,600 2,126
Current 509 922
Non-current $ 1,091 $ 1,204