XML 100 R93.htm IDEA: XBRL DOCUMENT
v3.21.2

Debt - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Jan. 15, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Disclosure [Abstract] |  |  |
Accrued interest compounded and added to principal |  | $ 21 |
Unpaid cash interest compounded to principal |  | $ 10 |
Debt due within one year | $ 546 |  | $ 6,177

X
- Definition Debt Instrument, Accrued Interest Compounded To Principal + References No definition available. + Details
Name: | sdrl_DebtInstrumentAccruedInterestCompoundedToPrincipal
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Unpaid Cash Interest Compounded To Principal + References No definition available. + Details
Name: | sdrl_DebtInstrumentUnpaidCashInterestCompoundedToPrincipal
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-term Debt, Current Maturities, Net of Debt Issuance Costs + References No definition available. + Details
Name: | sdrl_LongtermDebtCurrentMaturitiesNetofDebtIssuanceCosts
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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