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Property, Plant and Equipment - Additional Information (Detail)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Jun. 30, 2016 USD ($) Drilling_Rig Rigs	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Drilling_Rig Transactions	Sep. 30, 2015 USD ($)
Diamond Offshore Drilling, Inc. [Member]
Property, Plant and Equipment [Line Items]
Number of sale and leaseback transactions | Transactions				3
Proceed from sale and leaseback transactions				$ 158,000,000
Gain (loss) on sale sale and leaseback transactions				0
Aggregate amount of future commitments under the operating leases and contractual services agreements				$ 491,000,000
Diamond Offshore Drilling, Inc. [Member] | Ge Oil And Gas [Member]
Property, Plant and Equipment [Line Items]
Service agreement term	10 years
Diamond Offshore [Member]
Property, Plant and Equipment [Line Items]
Asset impairment loss, before tax and noncontrolling interests		$ 672,000,000	$ 2,000,000		$ 361,000,000
Asset impairment loss, net of tax and noncontrolling interests		$ 263,000,000	$ 1,000,000		$ 159,000,000
Diamond Offshore [Member] | Drilling Rigs [Member]
Property, Plant and Equipment [Line Items]
Number rigs used for evaluated for impairment | Drilling_Rig		15		9
Number of equipments impaired | Rigs		8
Diamond Offshore [Member] | Ultra Deepwater [Member]
Property, Plant and Equipment [Line Items]
Number of equipments impaired | Rigs		3
Diamond Offshore [Member] | Deepwater [Member]
Property, Plant and Equipment [Line Items]
Number of equipments impaired | Rigs		3
Diamond Offshore [Member] | Mid-Water Rigs [Member]
Property, Plant and Equipment [Line Items]
Number of equipments impaired | Rigs		2

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-Publisher FASB
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