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Acquisitions (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Plains Exploration & Production Company and McMoRan Exploration Co [Member] | Jun. 30, 2013 Plains Exploration & Production Company and McMoRan Exploration Co [Member] | Jun. 30, 2014 Eagle Ford [Member] | Jun. 30, 2014 Eagle Ford [Member] | Jun. 20, 2014 Eagle Ford [Member] | Jun. 30, 2014 Deepwater Gulf of Mexico Interests [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Adjustment to Oil and Gas Properties |  |  |  |  | $ 20 |  |  |  |  |
Business Acquisition, Adjustment to Goodwill |  |  |  |  | 22 |  |  | 221 |  |
Business Acquisition, Adjustment to Deferred Income Tax Assets |  |  |  |  | (42) |  |  |  |  |
Disposal Date |  |  |  |  |  |  |  | Jun. 20, 2014 |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | 3,100 |  | 919
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  | Apr. 01, 2014 |  | Jun. 30, 2014
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances | 58 | (183) | 58 | (183) |  | (183) | 58 |  |  |
Escrow Deposit Disbursements Related to Property Acquisition | 414 |  | 414 |  |  |  | 414 | 414 | 1,300 |
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Subject to Depletion |  |  |  |  |  |  |  |  |  | 460
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Not Subject to Depletion |  |  |  |  |  |  |  |  |  | $ 476

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- Definition Adjustment during the period to the amount of oil and gas properties not subject to depletion recognized as of the acquisition date. + References No definition available. + Details
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- Definition Adjustment during the period to the amount of oil and gas properties subject to depletion recognized as of the acquisition date. + References No definition available. + Details
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