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Revenue from Contracts with Customers - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Revenue From Contract With Customers [Line Items]
Amortization of deferred contract costs	$ 15
Other Current Assets [Member]
Revenue From Contract With Customers [Line Items]
Deferred contract costs	9
Other Noncurrent Assets [Member]
Revenue From Contract With Customers [Line Items]
Deferred contract costs	$ 2

X

- Definition

Amortization of deferred contract costs.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Deferred Contract Costs

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Revenue From Contract With Customers [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	sdrl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: