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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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