XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.25.3

Related party transactions - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Related Party Transactions [Abstract] |  |
Management fee received | $ 5 | $ 7

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