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Segment Information (Reconciliation Of Segment Income From Operations To Income Before Income Taxes) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Income from operations $ 1,008 $ 301 $ 960 $ 1,156 $ 1,189 $ 1,895 $ 1,307 $ 956 $ 3,425 $ 5,347 $ 3,745
Minnesota Assets sale settlement gain                 6 177 12
Nonoperating income (expense) including related party activity                 (179) [1] (109) [1] (26) [1]
Income before income taxes                 3,246 5,238 3,719
Operating Segments [Member]
                     
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Income from operations                 3,791 [2] 5,624 [2] 4,061 [2]
Corporate, Non-Segment [Member]
                     
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Income from operations                 (271) [2],[3],[4] (336) [2],[3],[4] (316) [2],[3],[4]
Segment Reconciling Items [Member]
                     
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Minnesota Assets sale settlement gain                 0 183 [5] 0
Pension settlement expenses                 $ (95) [6] $ (124) [6] $ 0 [6]
[1] Includes related party net interest and other financial income.
[2] Included in the Pipeline Transportation segment for 2013 and 2012 are $20 million and $4 million of corporate overhead costs attributable to MPLX, which were included in items not allocated to segments prior to MPLX’s October 31, 2012 initial public offering. These expenses are not currently allocated to other segments.
[3] Corporate overhead costs attributable to MPLX were included in the Pipeline Transportation segment subsequent to MPLX’s October 31, 2012 initial public offering.
[4] Corporate and other unallocated items consists primarily of MPC’s corporate administrative expenses, including allocations from the Marathon Oil Companies for periods prior to the Spinoff, and costs related to certain non-operating assets.
[5] See Note 6.
[6] See Note 22.