Taxes (Details 1) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Notes and other explanatory information [abstract]
Deferred tax assets	$ 8,244	$ 9,565
Deferred tax liabilities	445	870
Deferred tax liability (asset) at beginning of period	7,799	8,695
[custom:EffectInIncomeStatementAssets]	(112)	873
[custom:EffectInIncomeStatementDeferredTaxLiability]	17	(98)
[custom:EffectInIncomeStatement]	(129)	971
[custom:OtherComprehensiveIncomeDeferredTaxAsset]	2	602
[custom:OtherComprehensiveIncomeLiabilities]	7	15
Income tax relating to components of other comprehensive income	(5)	587
[custom:TransfersBetweenAssetsAndLiabilitiesDeferredTaxAssets]	(103)	50
[custom:TransfersBetweenAssetsAndLiabilitiesDeferredTaxLiability]	(103)	50
[custom:TransferBetweenAssetsAndLiabilitiesDeferredTaxesNet]
[custom:IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxAsset]	954	(1,159)
[custom:IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiability]	56	(31)
Increase (decrease) through net exchange differences, deferred tax liability (asset)	898	(1,128)
[custom:TransferToAssetToHeldForSaleAssets]	(10)
[custom:TransferToHeldForSaleEnergyAssetsLiabilities]	(295)
[custom:TransferToAssetToHeldForSaleDeferredTaxesNet]	285
Deferred tax assets	8,975	9,931
Deferred tax liabilities	127	806
Deferred tax liability (asset) at end of period	$ 8,848	$ 9,125

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph o
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 56
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard
-URIDate 2024-03-27