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v3.25.3

Other current and non-current liabilities - Future Amortization of Unfavorable Contracts (Details) $ in Millions | Sep. 30, 2025 USD ($)
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Payables and Accruals [Abstract] |
Remainder of 2025 | $ 2
2026 | 3
Total | $ 5

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of unfavorable contracts over their estimated remaining economic lives. + References No definition available. + Details
Name: | sdrl_AmortizationOfUnfavorableContracts
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amortization Of Unfavorable Contracts, Remainder Of Fiscal Year + References No definition available. + Details
Name: | sdrl_AmortizationOfUnfavorableContractsRemainderOfFiscalYear
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amortization Of Unfavorable Contracts, Year One + References No definition available. + Details
Name: | sdrl_AmortizationOfUnfavorableContractsYearOne
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration