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v3.25.3

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