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Financial Instruments (Unaudited) Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2014
Time Deposits [Member]
Dec. 31, 2013
Time Deposits [Member]
Jun. 30, 2014
Plains Offshore Operations Inc. [Member]
Cash and Cash Equivalents [Line Items]              
Credit Derivative, Maximum Exposure, Undiscounted $ 62            
Cash and cash equivalents $ 1,458 $ 1,985 $ 3,294 $ 3,705 $ 72 $ 211  
Preferred Stock, Dividend Rate, Percentage             8.00%