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ACQUISITIONS (Redeemable Noncontrolling Interest) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 03, 2013 | Dec. 31, 2013 Plains Offshore Operations Inc. [Member] | Dec. 31, 2011 Plains Offshore Operations Inc. [Member] | May 31, 2013 Plains Offshore Operations Inc. [Member] | Dec. 31, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jun. 30, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Dec. 31, 2013 5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] | Dec. 31, 2011 Minimum [Member] Plains Offshore Operations Inc. [Member] ft
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Of Subsidiary |  |  |  |  |  | 450,000 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 8.00% |  | 5.75% |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  |  | $ 450,000,000 |  |  |  |  |
Class of Warrants or Rights, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 20 |  |  |  |  |
Nondetachable Warrants |  |  |  |  |  | 9,100,000 |  |  |  |  |
Common Stock Held In Escrow |  |  |  |  |  | 87,000,000 |  |  |  |  |
Depth of Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  | 500
Equity Interest Held By Outside Party, Percent |  |  |  |  |  | 20.00% |  |  |  |  |
Preferred Stock Quarterly Cash Dividend Annual Rate Percentage |  |  |  |  | 8.00% |  |  |  |  |  |
Preferred Stock Dividend Rate Percentage Deferred |  |  |  |  | 2.00% |  |  |  |  |  |
Dividends Payable |  |  |  |  | 23,000,000 |  |  |  |  |  |
Participating Dividends Future Multiple |  |  |  |  | 4 |  |  |  |  |  |
Percentage Of Common Shares Diluted Basis Related To Failed Exit Event Consideration |  |  |  |  |  | 49.00% |  |  |  |  |
Failed Exit Event Parents Purchase Amount Of Junior Preferred Stock |  |  |  |  |  | 300,000,000 |  |  |  |  |
Liquidation Preference Multiple |  |  |  |  |  | 1.25 |  |  |  |  |
Redeemable noncontrolling interest | 716,000,000 | 0 |  | 259,000,000 | 716,000,000 |  | 708,000,000 |  |  |  |
Preferred Stock Conversion, Converted Instrument, Expiration or Due Date |  |  |  |  |  |  |  |  | Jul. 09, 2013 |  |
Payments for Repurchase of Preferred Stock and Preference Stock | 228,000,000 | 0 | 0 |  |  |  |  |  |  |  |
Royalty Trust Units Issued, Conversion of Debt or Equity Instrument | 17,700,000 |  |  |  |  |  |  |  |  |  |
Royalty Trust Units, Fair Value Disclosure |  |  |  | $ 31,000,000 |  |  |  |  |  |  |

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