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Income taxes - Tax loss carryforward (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Taxes losses carryforward | $ 5,908 | $ 5,757 |
Deferred tax asset (liability) | 9,357 | 9,560 | $ 8,565
Employee post retirement obligations |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | 411 | 504 |
Provision For litigation |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | 364 | 346 |
Asset Retirement Obligations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | 4,349 | 4,384 |
Fair value of financial instruments |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | 839 | 1,373 |
Fair Value Of Property Plant And Equipment [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | (2,392) | (2,857) |
Other temporary differences [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | (122) | 53 |
Assets Temporary Differences [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | 10,770 | 11,441 |
Liabilities Temporary Differences [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Deferred tax asset (liability) | $ (1,413) | $ (1,881) |

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