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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Rig Assets Excluding Jackup Rigs |
Property, Plant and Equipment |
Operating rig asset depreciable life, operating days | 4927 days
Non-operating rig asset depreciable life | 20 years
Jack Up Rigs |
Property, Plant and Equipment |
Operating rig asset depreciable life, operating days | 8030 days
Non-operating rig asset depreciable life | 30 years
Jack Up Rigs | Minimum |
Property, Plant and Equipment |
Estimated loss on sale | $ 50
Jack Up Rigs | Maximum |
Property, Plant and Equipment |
Estimated loss on sale | $ 70
Buildings | Minimum |
Property, Plant and Equipment |
Estimated useful life | 10 years
Buildings | Maximum |
Property, Plant and Equipment |
Estimated useful life | 30 years
Well Servicing Rigs | Minimum |
Property, Plant and Equipment |
Estimated useful life | 3 years
Well Servicing Rigs | Maximum |
Property, Plant and Equipment |
Estimated useful life | 15 years
Marine Transportation and Supply Vessels | Minimum |
Property, Plant and Equipment |
Estimated useful life | 10 years
Marine Transportation and Supply Vessels | Maximum |
Property, Plant and Equipment |
Estimated useful life | 25 years
Oilfield Hauling and Mobile Equipment and Other Machinery and Equipment | Minimum |
Property, Plant and Equipment |
Estimated useful life | 3 years
Oilfield Hauling and Mobile Equipment and Other Machinery and Equipment | Maximum |
Property, Plant and Equipment |
Estimated useful life | 10 years

X
- Definition Estimated amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References No definition available. + Details
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- Definition Useful life of operating rig asset used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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