Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues and other income:
Sales and other operating revenues (including consumer excise taxes)	$ 25,438	$ 26,256	$ 75,567	$ 75,263
Income from equity method investments	29	9	121	16
Net gain on disposal of assets	2	1	14	3
Other income	12	8	57	40
Total revenues and other income	25,481	26,274	75,759	75,322
Costs and expenses:
Cost of revenues (excludes items below)	21,935	23,553	65,571	65,907
Purchases from related parties	112	103	401	254
Consumer excise taxes	1,622	1,631	4,736	4,685
Depreciation and amortization	322	299	967	888
Selling, general and administrative expenses	342	305	1,004	912
Other taxes	86	82	288	259
Total costs and expenses	24,419	25,973	72,967	72,905
Income from operations	1,062	301	2,792	2,417
Net interest and other financial income (costs)	(50)	(47)	(144)	(140)
Income before income taxes	1,012	254	2,648	2,277
Provision for income taxes	333	81	898	775
Net income	679	173	1,750	1,502
Less net income attributable to noncontrolling interests	7	5	24	16
Net income attributable to MPC	$ 672	$ 168	$ 1,726	$ 1,486
Basic:
Net income attributable to MPC per share	$ 2.38	$ 0.54	$ 5.99	$ 4.63
Weighted average shares outstanding (in shares)	282	309	288	321
Diluted:
Net income attributable to MPC per share	$ 2.36	$ 0.54	$ 5.95	$ 4.60
Weighted average shares outstanding (in shares)	284	311	290	323
Dividends paid (in USD per share)	$ 0.50	$ 0.42	$ 1.34	$ 1.12