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Other current and non-current liabilities - Movement In Unfavorable Drilling Contracts (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025
Payables And Accruals [Roll Forward]
Net carrying amount, beginning balance	$ 10	$ 16	$ 22
Amortization	(5)	(6)	(6)
Net carrying amount, ending balance	$ 5	$ 10	$ 16

X

- Definition

Net Amount Of Unfavorable Contracts To Be Amortized

+ References

No definition available.

+ Details

Name:	sdrl_NetAmountOfUnfavorableContractsToBeAmortized
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Payables And Accruals

+ References

No definition available.

+ Details

Name:	sdrl_PayablesAndAccrualsRollForward
Namespace Prefix:	sdrl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unfavourable Contracts, Amortization

+ References

No definition available.

+ Details

Name:	sdrl_UnfavourableContractsAmortization
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration