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Related-party transactions (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Assets | $ 217,067 | $ 187,191
Liabilities | 138,092 | 117,355
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 17,965 | 14,309
Liabilities | 3,924 | 3,449
Current Assets Or Current Liabilities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 2,684 | 2,603
Liabilities | 1,676 | 2,119
Non Current Assets Or Non Current Liabilities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 15,281 | 11,706
Liabilities | 2,248 | 1,330
Petros [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 64 | 56
Liabilities | 305 | 301
Government bonds [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 1,819 | 1,689
Banks Controlled By The Brazilian Government [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 15,526 | 11,811
Liabilities | 2,119 | 1,567
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 278 | 602
Brazilian Federal Government [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Liabilities | 1,378 | 1,422
P P S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Liabilities | 28 | 57
Other Government Entities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 138 | 58
Liabilities | 80 | 71
Other Associates And Joint Ventures [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 95 | 72
Liabilities | 10 | 21
Joint Venture And Associates Sub Total [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 140 | 93
Liabilities | 14 | 31
Petrochemical Companies [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 45 | 21
Liabilities | 4 | 10
Government Entities Sub Total [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets | 17,761 | 14,160
Liabilities | $ 3,605 | $ 3,117

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