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Other current and non-current liabilities - Narrative (Details)	9 Months Ended
	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