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Related party transactions - Summary of Average Bareboat Charter Rates per Day (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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West Taurus |
Sale Leaseback Transaction [Line Items] |
2021 | $ 96
2022 | 96
2023 | 181
2024 | 177
2025 and thereafter | 0
West Hercules |
Sale Leaseback Transaction [Line Items] |
2021 | 96
2022 | 96
2023 | 183
2024 | 176
2025 and thereafter | 0
West Linus |
Sale Leaseback Transaction [Line Items] |
2021 | 99
2022 | 92
2023 | 189
2024 | 153
2025 and thereafter | $ 122

X
- Definition The average bareboat charter rate per day based on the Base LIBOR Interest Rate for the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | sdrl_BareboatCharterRatePerDayAverageYearFiveAndThereafter
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The average bareboat charter rate per day based on the Base LIBOR Interest Rate for the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | sdrl_Bareboatcharterrateperdayaverageyearfour
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The average bareboat charter rate per day based on the Base LIBOR Interest Rate for the first fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | sdrl_Bareboatcharterrateperdayaverageyearone
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The average bareboat charter rate per day based on the Base LIBOR Interest Rate for the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | sdrl_Bareboatcharterrateperdayaverageyearthree
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The average bareboat charter rate per day based on the Base LIBOR Interest Rate for the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | sdrl_Bareboatcharterrateperdayaverageyeartwo
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_SaleLeasebackTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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