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Other current and non-current liabilities - Future Amortization of Unfavorable Contracts (Details) $ in Millions	Sep. 30, 2025 USD ($)
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

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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

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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

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Namespace Prefix:	us-gaap_
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Period Type:	duration