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v3.21.2

Related party transactions - Average Bareboat Charter Rates (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($)
Aquadrill |
Related Party Transaction [Line Items] |
Write off | $ 8,000
West Hercules |
Related Party Transaction [Line Items] |
2021 | 96
2022 | 96
2023 | 183
2024 | 176
2025 and thereafter | 0
West Linus |
Related Party Transaction [Line Items] |
2021 | 99
2022 | 92
2023 | 189
2024 | 153
2025 and thereafter | $ 122

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- Definition Bareboat Charter, Rate Per Day, Average, Year Five And Thereafter + References No definition available. + Details
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Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bareboat Charter, Rate Per Day, Average, Year Four + References No definition available. + Details
Name: | sdrl_BareboatCharterRatePerDayAverageYearFour
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bareboat Charter, Rate Per Day, Average, Year One + References No definition available. + Details
Name: | sdrl_BareboatCharterRatePerDayAverageYearOne
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bareboat Charter, Rate Per Day, Average, Year Three + References No definition available. + Details
Name: | sdrl_BareboatCharterRatePerDayAverageYearThree
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bareboat Charter, Rate Per Day, Average, Year Two + References No definition available. + Details
Name: | sdrl_BareboatCharterRatePerDayAverageYearTwo
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=sdrl_AquadrillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestHerculesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestLinusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |