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Drilling Units - Summary Of Net Book Value (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Impairment	$ (414)	$ (696)
Net book value	12,780	13,464
Drilling Unit [Member]
Property, Plant and Equipment [Line Items]
Cost	17,452	17,335
Accumulated depreciation	(4,507)	(4,119)
Impairment	(414)
Net book value	$ 12,531	$ 13,216

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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).

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