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Accrued Expenses and Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Aruba Refinery [Member]
employees
Dec. 31, 2012
Aruba Refinery [Member]
Accrued Expenses        
Defined benefit plan liabilities, current $ 32 $ 37    
Wage and other employee-related liabilities, current 282 259    
Uncertain income tax position liabilities, current 0 0    
Environmental liabilities, current 27 39    
Accrued interest expense, current 96 108    
Derivative liabilities, current 14 25    
Asset retirement obligations, current 5 6    
Other accrued liabilities, current 134 121    
Accrued expenses 590 595    
Other Long-Term Liabilities        
Defined benefit plan liabilities, noncurrent 982 795    
Wage and other employee-related liabilities, noncurrent 91 79    
Uncertain income tax position liabilities, noncurrent 391 337    
Environmental liabilities, noncurrent 242 235    
Derivative liabilities, noncurrent 0 0    
Asset retirement obligations, noncurrent 103 81    
Other accrued liabilities, noncurrent 321 354    
Other long-term liabilities 2,130 1,881    
One-Time Severance Benefits (Textual)        
Number of employees notified of termination     495  
Termination date     Nov. 15, 2012  
Severance liability     41 10
Severance payments (31)      
Severance costs       $ 41