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Property, Plant and Equipment - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	May. 31, 2015 well	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($) well
Property, Plant and Equipment
Cumulative full cost ceiling limitation impairment	$ 7,300,000,000		$ 7,300,000,000				$ 3,700,000,000
Full cost ceiling limitation impairment	1,000,000,000		3,600,000,000	$ 164,800,000
Impairment	1,074,588,000	$ 54,000	3,647,845,000	167,966,000
Drilling carry costs incurred			3,600,000
Repsol E&P USA, Inc.
Property, Plant and Equipment
Minimum net wells | well								484
Net wells | well						453
Drilling carry costs incurred	3,600,000
Repsol E&P USA, Inc. | Potential drilling carry costs
Property, Plant and Equipment
Drilling carry determination, amount per well short								$ 1,000,000
Total drilling carry, maximum	31,000,000		31,000,000					$ 75,000,000.0
Repsol E&P USA, Inc.
Property, Plant and Equipment
Drilling carry received or billed				$ 205,600,000
Drilling Assets
Property, Plant and Equipment
Impairment	19,800,000
Buildings and structures
Property, Plant and Equipment
Impairment	15,400,000		$ 15,400,000
Other Current Assets | Permian Region | Drilling Assets
Property, Plant and Equipment
Assets classified as held-for-sale					$ 20,000,000
Loss on sale of assets	$ 3,500,000

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