Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment
Property, plant and equipment, gross	$ 15,244,631,000	$ 14,436,262,000
Less: accumulated depreciation and amortization	(6,646,818,000)	(5,724,174,000)
Property, plant and equipment, net	8,597,813,000	8,712,088,000	8,629,946,000
Repair and maintenance expense	510,800,000	563,500,000	586,400,000
Interest costs capitalized	13,000,000	19,400,000	24,000,000
Land
Property, Plant and Equipment
Property, plant and equipment, gross	63,733,000	49,965,000
Buildings
Property, Plant and Equipment
Property, plant and equipment, gross	163,962,000	154,878,000
Dirlling, workover and well-servicing rigs, and related equipment
Property, Plant and Equipment
Property, plant and equipment, gross	12,818,136,000	12,364,021,000
Marine transportation and supply vessels
Property, Plant and Equipment
Property, plant and equipment, gross	14,062,000	14,054,000
Oilfield hauling and mobile equipment
Property, Plant and Equipment
Property, plant and equipment, gross	1,322,798,000	1,313,339,000
Other machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	168,465,000	176,468,000
Construction-in-progress
Property, Plant and Equipment
Property, plant and equipment, gross	$ 693,475,000	$ 363,537,000