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Financial and capital risk management - Effects of derivatives on the income statement, cash flow and other comprehensive income (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | $ 563 | $ (270) | $ 755 | $ 591
Financial settlement inflows outflows |  | 134 | (42) | 172 | (118)
Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 558 | (288) | 774 | 575
Financial settlement inflows outflows | [1] | 113 | 45 | 130 | 51
Commodity price risk [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 4 | 26 | (21) | 34
Financial settlement inflows outflows |  | 21 | (87) | 42 | (169)
Cdi Tjlp Versus Usd Fixed And Floating Rate Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 144 | (121) | 188 | 269
Financial settlement inflows outflows |  | (4) | (17) | (8) | (43)
Ipca Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 23 | (11) | 30 | 66
Financial settlement inflows outflows |  | 2 | 8 | 3 | 11
Dollar Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 376 | (163) | 538 | 198
Financial settlement inflows outflows |  | 98 | 54 | 118 | 84
Libor Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 2 | 7 | 5 | 42
Financial settlement inflows outflows | [1] | 4 |  | 4 | (1)
Forwards [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 13 |  | 13 |
Financial settlement inflows outflows | [1] | 13 |  | 13 |
Bunker Oil Gasoil And Brent [Member] | Commodity price risk [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | 4 | 10 | (20) | 25
Financial settlement inflows outflows |  | 1 | 6 | 3 | 9
Energy Transition Materials [Member] | Commodity price risk [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  |  | 16 | (1) | 9
Financial settlement inflows outflows |  | 20 | (93) | 39 | (178)
Other Options [Member] | Commodity price risk [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Gain (loss) recognized in the income statement |  | $ 1 | $ (8) | $ 2 | $ (18)
[1] | A substantial part of the balances is held with financial institutions in Brazil and, in local currency, they are deemed investment grade.

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