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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Consolidated Balance Sheets (Additional Information) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Variable Interest Entity [Line Items] |  |
Cumulative full cost ceiling limitation impairment charges | $ 8,200.0 | $ 3,700.0
Royalty Trusts |  |
Variable Interest Entity [Line Items] |  |
Reserves for future expenses | 3.0 | 3.0
Cumulative full cost ceiling limitation impairment charges | $ 976.2 | $ 42.3

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- Definition Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation. + References No definition available. + Details
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- Definition Reserves held by the trustee for future general and administrative expenses. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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