Property, Plant and Equipment - Additional Information (Detail)	1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 29, 2016	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Rig Drilling_Rig Transactions Drillship	Dec. 31, 2015 USD ($) Rig Drilling_Rig Drillship	Dec. 31, 2014 USD ($) Rig
Property, Plant and Equipment [Line Items]
Capitalized interest related to the construction and upgrade of qualifying assets			$ 51,000,000	$ 36,000,000	$ 80,000,000
Net book value of equipment			15,230,000,000	15,477,000,000
Construction in process			$ 379,000,000	494,000,000
Diamond Offshore [Member]
Property, Plant and Equipment [Line Items]
Asset impairment loss, before tax and noncontrolling interests		$ 672,000,000		861,000,000
Asset impairment loss, net of tax and noncontrolling interests		$ 263,000,000		341,000,000
Number of rigs sold after impaired | Rig			20
Number of cold-stacked rigs | Rig			8
Number of rigs previously impaired, currently operating | Rig			2
Diamond Offshore [Member] | Ultra-deepwater Drillships [Member]
Property, Plant and Equipment [Line Items]
Net book value of equipment				$ 655,000,000
Construction in process					$ 225,000,000
Number of equipment's delivered | Drillship				1
Diamond Offshore [Member] | Ultra-deepwater Semisubmersible Rig [Member]
Property, Plant and Equipment [Line Items]
Net book value of equipment			$ 774,000,000
Construction in process				$ 270,000,000
Number of equipment's delivered | Drillship			1
Diamond Offshore [Member] | Drilling Rigs [Member]
Property, Plant and Equipment [Line Items]
Number rigs evaluated for impairment | Drilling_Rig			15	25
Number of equipment impaired | Rig			8	17
Diamond Offshore [Member] | Ultra Deepwater [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig			3	2
Diamond Offshore [Member] | Deepwater [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig			3	1
Diamond Offshore [Member] | Mid-Water Rigs [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig			2
Diamond Offshore [Member] | Mid Water Floater [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig				9
Diamond Offshore [Member] | Jack-ups [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig				5
Diamond Offshore [Member] | Mid Water Drilling Rigs [Member]
Property, Plant and Equipment [Line Items]
Number of equipment impaired | Rig					6,000,000
Asset impairment loss, before tax and noncontrolling interests					$ 109,000,000
Asset impairment loss, net of tax and noncontrolling interests					$ 55,000,000
Number of property plant and equipment scrapped | Rig					6
Diamond Offshore Drilling, Inc. [Member]
Property, Plant and Equipment [Line Items]
Number of sale and leaseback transactions | Transactions			4
Proceed from sale and leaseback transactions			$ 210,000,000
Gain (loss) on sale sale and leaseback transactions			0
Aggregate amount of future commitments under the operating leases and contractual services agreements			655,000,000
Diamond Offshore Drilling, Inc. [Member] | Ge Oil And Gas [Member]
Property, Plant and Equipment [Line Items]
Service agreement term	10 years
Diamond Offshore Drilling, Inc. [Member] | Wells Control Equipment [Member]
Property, Plant and Equipment [Line Items]
Aggregate equipment lease expense			$ 34,000,000