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Acquisitions (Unaudited) Redeemable Noncontrolling Interest (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  |
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Plains Offshore Operations Inc. [Member] | Dec. 31, 2011 Plains Offshore Operations Inc. [Member] | May 31, 2013 Plains Offshore Operations Inc. [Member] | Jun. 30, 2013 8% Convertible Perpetual Preferred Stock [Member] | Jul. 09, 2013 8% Convertible Perpetual Preferred Stock [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% |  |
Gross Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 450 |  |  |  |
Nondetachable Warrants |  |  |  | 9,100,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 20 |  |  |  |
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 |  |  | 6.00% |  |  |  |  |
Preferred Stock Dividend Rate Percentage Deferred |  |  | 2.00% |  |  |  |  |
Dividends Payable |  |  | 18 |  |  |  |  |
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 |  |  |  |
Liquidation Preference Multiple |  |  |  | 1.25 |  |  |  |
Temporary Equity, Redemption Value | $ 782 | $ 0 | $ 752 |  | $ 749 | $ 30 | $ 1 |

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- Definition The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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