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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

X

- 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

X

- Definition

Bareboat Charter, Rate Per Day, Average, Year Four

+ References

No definition available.

+ Details

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

X

- Definition

Bareboat Charter, Rate Per Day, Average, Year One

+ References

No definition available.

+ Details

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

X

- Definition

Bareboat Charter, Rate Per Day, Average, Year Three

+ References

No definition available.

+ Details

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Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Bareboat Charter, Rate Per Day, Average, Year Two

+ References

No definition available.

+ Details

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Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

+ Details

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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

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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