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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Redeemable Noncontrolling Interest - PXP) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2011 | Dec. 31, 2016 | Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Common Stock Held in Trust |  |  | 1,574,000,000 | 1,374,000,000
Plains Offshore Operations Inc. |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Ownership percentage | 20.00% |  |  |
Plains Offshore Operations Inc. |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 20 | $ 20 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 500,000 | 9,100,000 |  |
Preferred Stock, Dividend Rate, Potential Deferment Rate | 2.00% |  |  |
Plains Offshore Operations Inc. | 8% Convertible Preferred Stock |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Preferred Stock, Shares Issued | 24,000 | 450,000 |  |
Preferred Stock, Dividend Rate, Percentage |  | 8.00% |  |
Proceeds from Issuance of Convertible Preferred Stock | $ 24 | $ 450 |  |
Plains Offshore Operations Inc. | Common Class A |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Common Stock Held in Trust |  | 87,000,000 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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