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Financial Instruments (Unaudited) Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Time Deposits [Member]
Dec. 31, 2013
Time Deposits [Member]
Mar. 31, 2014
Plains Offshore Operations Inc. [Member]
Cash and Cash Equivalents [Line Items]              
Credit Derivative, Maximum Exposure, Undiscounted $ 11            
Cash and cash equivalents $ 1,342 $ 1,985 $ 9,595 $ 3,705 $ 39 $ 211  
Preferred Stock, Dividend Rate, Percentage             8.00%