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Segments & Geographic Information - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Segments
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2012
USD ($)
Business Acquisition [Line Items]                        
Number of operating segments | Segments                 2      
Refinery, purchase price                       $ 180
Grants receivable                       $ 30
Operating revenue $ 9,502 $ 11,107 $ 10,707 $ 9,388 $ 9,647 $ 11,178 $ 10,621 $ 8,916 $ 40,704 $ 40,362 $ 37,773  
Intersegment Sales/Other | Exchanged products                        
Business Acquisition [Line Items]                        
Operating revenue                 $ 3,108 $ 5,104 $ 5,352