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Drilling Fleet (Impairment held and used) (Details) - Midwater floaters $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares
Impairment of assets held and used
Impairment of in use assets	$ 94
Loss associated with in use asset impairment, net of tax	$ 95
Loss associated with impairment, net of tax (per share) | $ / shares	$ 0.25

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- Definition

Represents the loss recognized for an asset classified as held and used, net of tax.

+ References

No definition available.

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- 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.

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- Definition

After tax earnings per share or per unit impact arising from asset impairment.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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