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Other Contingencies and Commitments (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2009
Other Contingencies and Commitments (Textuals)      
Indemnifications Equilon Motiva max future payments   $ 300  
Indemnifications Equilon Motiva YTD payments made 48    
Indemnifications Unocal Environ Liabilities Max Obligation     200
Equity Redetermination Naval Petro Reserve Max BT Liability $ 200 $ 200