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Commitments and guarantee - Guarantee (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Guarantee |  | $ 2,166 | $ 2,200
Restricted cash |  | 73 | 50
Liability | [1] | 103 | 542
Associatesa And Joint Ventures [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Guarantee |  | 1,522 | 1,513
Restricted cash |  |  |
Liability | [1] | 103 | 542
Assets Retirement Obligations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Guarantee |  | 644 | 605
Restricted cash |  | 73 | 50
Liability | [1] |  |
Loans And Financing [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Guarantee |  |  | 82
Restricted cash |  |  |
Liability | [1] |  |
[1] | The fair value of these financial guarantees is recorded as “Other financial liabilities” (note 14).

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