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Derivative financial instruments and debt excluding lease liabilities - Comparison of the Fair Value with the Carrying Amount of Debt Excluding Lease Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Financial Instruments [Abstract] |  |
Carrying amount | $ 43,449 | $ 46,710
Fair value | $ 39,681 | $ 43,142

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- Definition Carrying Amount Of Debt Excluding Leases Liabilities + References No definition available. + Details
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Namespace Prefix: | shel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value of debt excluding leases liabilities. + References No definition available. + Details
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Namespace Prefix: | shel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
Name: | shel_FinancialInstrumentsAbstract
Namespace Prefix: | shel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration