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Acquisitions and Investments (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) (Galveston Bay Refinery And Related Assets [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Galveston Bay Refinery And Related Assets [Member]
 
Business Acquisition [Line Items]  
Inventories $ 935
Other current assets 1
Property, plant and equipment, net 1,274
Other noncurrent assets 88
Accounts payable (12)
Payroll and benefits payable (14)
Long-term debt due within one year (2) [1]
Other current liabilities (6)
Long-term debt (58) [1]
Defined benefit postretirement plan obligations (43)
Deferred credits and other liabilities (75)
Total $ 2,088
[1] Represents a capital lease obligation assumed