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v3.26.1

Related party transactions - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Related Party Transactions [Abstract] |  |
Amounts due from related parties, net | $ 7 | $ 0
Management fee received |  | $ 3

X
- Definition Related Party Transaction, Management Fee Received + References No definition available. + Details
Name: | sdrl_RelatedPartyTransactionManagementFeeReceived
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration