XML 154 R142.htm IDEA: XBRL DOCUMENT v3.20.4

Debt - Additional Information (Details) - USD ($) $ in Millions	4 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Jul. 01, 2018	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Write off of unamortized debt discount	$ 87	$ 0	$ 0	$ 87	$ 0

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- Definition

Write-Off Of Debt Discount

+ References

No definition available.

+ Details

Name:	sdrl_WriteOffOfDebtDiscount
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration