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Consolidated Statement of Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Includes excise taxes on petroleum products sales $ 3,508 $ 3,463 $ 6,868 $ 6,825