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Financial and capital risk management - Debentures convertible into shares (Details) $ in Millions | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) R$ / shares | Dec. 31, 2019 USD ($) EquityInstruments | Dec. 31, 2018 USD ($) | Dec. 31, 2020 item | Dec. 31, 2020 EquityInstruments | Dec. 31, 2020 | Dec. 09, 2020 USD ($)
Derivative financial instruments. |  |  |  |  |  |  |
Financial settlement inflows (outflows) | $ (34) | $ (324) | $ (67) |  |  |  |
Call options -Debentures- Sold |  |  |  |  |  |  |
Derivative financial instruments. |  |  |  |  |  |  |
Notional | EquityInstruments |  | 140,239 |  |  |  |  |
Average strike per share |  |  |  | 8,346.00 |  | 8.00 | 8.00
Fair value of liabilities |  | $ (51) |  |  |  |  |
Financial settlement inflows (outflows) | $ 235 |  |  |  |  |  |
Value at risk |  |  |  |  |  |  | $ 241
Debentures convertible into shares |  |  |  |  |  |  |
Derivative financial instruments. |  |  |  |  |  |  |
Notional | EquityInstruments |  | 1,009 |  |  | 976 |  |
Average strike per share | R$ / shares | 7,121 |  |  |  |  |  |

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