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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-Name Accounting Standards Codification

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The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

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Amount of interest capitalized during the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property, Plant and Equipment (Details) (USD $)	12 Months Ended
Property, Plant and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment
Property, plant and equipment, gross	$ 15,427,115,000us-gaap_PropertyPlantAndEquipmentGross	$ 15,244,631,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	(6,827,990,000)	(6,646,818,000)
Property, plant and equipment, net	8,599,125,000us-gaap_PropertyPlantAndEquipmentNet	8,597,813,000us-gaap_PropertyPlantAndEquipmentNet	8,712,088,000us-gaap_PropertyPlantAndEquipmentNet
Repair and maintenance expense	603,400,000	510,800,000	563,500,000
Interest costs capitalized	24,400,000us-gaap_InterestCostsCapitalized	13,000,000us-gaap_InterestCostsCapitalized	19,400,000us-gaap_InterestCostsCapitalized
Land
Property, Plant and Equipment
Property, plant and equipment, gross	63,311,000	63,733,000
Building
Property, Plant and Equipment
Property, plant and equipment, gross	165,826,000	163,962,000
Drilling, Workover and Well Servicing Rigs and Related Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	12,792,207,000	12,818,136,000
Transportation Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	14,123,000	14,062,000
Oilfield Hauling and Mobile Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	1,398,032,000	1,322,798,000
Other Machinery and Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	185,663,000	168,465,000
Construction in Progress
Property, Plant and Equipment
Property, plant and equipment, gross	781,374,000	693,475,000
Oil and Gas Properties
Property, Plant and Equipment
Property, plant and equipment, gross	$ 26,579,000