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Financial and capital risk management - Financial counterparties' ratings (Details 12) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Cash And Cash Equivalents Current [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | $ 5,029 | $ 4,797
Cash And Cash Equivalents Current [Member] | Moody Aa 1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 36 | 32
Cash And Cash Equivalents Current [Member] | Moody Aa 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 726 | 342
Cash And Cash Equivalents Current [Member] | Moody Aa 3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 190 | 239
Cash And Cash Equivalents Current [Member] | Moody A 1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 1,602 | 1,746
Cash And Cash Equivalents Current [Member] | Moody A 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 736 | 938
Cash And Cash Equivalents Current [Member] | Moody A 3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 713 | 918
Cash And Cash Equivalents Current [Member] | Moody Baa 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 51 | 7
Cash And Cash Equivalents Current [Member] | Moody Ba 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 798 | 411
Cash And Cash Equivalents Current [Member] | Moody Ba 3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 177 | 164
Derivatives [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 1,081 | 538
Derivatives [member] | Moody Aa 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  |  | 5
Derivatives [member] | Moody A 1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 139 | 97
Derivatives [member] | Moody A 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 296 | 145
Derivatives [member] | Moody A 3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 52 | 62
Derivatives [member] | Moody Ba 2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 426 | 174
Derivatives [member] | Moody Ba 3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | $ 168 | $ 54
[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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