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v3.25.3

Other current and non-current liabilities - Narrative (Details) | 9 Months Ended
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Sep. 30, 2025
Payables and Accruals [Abstract] |
Weighted average remaining amortization period | 9 months

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- Definition Finite-Lived Intangible Liabilities, Remaining Amortization Period + References No definition available. + Details
Name: | sdrl_FiniteLivedIntangibleLiabilitiesRemainingAmortizationPeriod
Namespace Prefix: | sdrl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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