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Financial and capital risk management - Financial counterparties' ratings (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Cash And Cash Equivalents Current [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | $ 4,797 | $ 11,905
Cash And Cash Equivalents Current [Member] | Moody's, Aa1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 32 | 128
Cash And Cash Equivalents Current [Member] | Moody's, Aa2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 342 | 285
Cash And Cash Equivalents Current [Member] | Moody's, Aa3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 239 | 495
Cash And Cash Equivalents Current [Member] | Moody's, A1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 1,746 | 1,145
Cash And Cash Equivalents Current [Member] | Moody's, A2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 938 | 3,478
Cash And Cash Equivalents Current [Member] | Moody's, A3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 918 | 1,518
Cash And Cash Equivalents Current [Member] | Moody's, Baa1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  |  | 90
Cash And Cash Equivalents Current [Member] | Moody's, Baa2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 7 | 10
Cash And Cash Equivalents Current [Member] | Moody's, Ba2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 411 | 2,763
Cash And Cash Equivalents Current [Member] | Moody's, Ba3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 164 | 1,988
Cash And Cash Equivalents Current [Member] | Moody S Other Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  |  | 5
Derivatives [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 538 | 131
Derivatives [member] | Moody's, Aa2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 5 | 15
Derivatives [member] | Moody's, Aa3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  |  | 34
Derivatives [member] | Moody's, A1 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 98 | 3
Derivatives [member] | Moody's, A2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 146 | 39
Derivatives [member] | Moody's, A3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | 63 | 20
Derivatives [member] | Moody's, Ba2 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 176 | 5
Derivatives [member] | Moody's, Ba3 Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure | [1] | 55 |
Derivatives [member] | Moody S Other Rating [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit exposure |  | $ (5) | $ 15
[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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