Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues and other income:
Sales and other operating revenues (including consumer excise taxes)	$ 26,844	$ 25,677	$ 50,129	$ 49,007
Income from equity method investments	57	7	92	7
Net gain on disposal of assets	11	1	12	2
Other income	21	18	45	32
Total revenues and other income	26,933	25,703	50,278	49,048
Costs and expenses:
Cost of revenues (excludes items below)	23,096	22,320	43,636	42,354
Purchases from related parties	130	79	289	151
Consumer excise taxes	1,599	1,596	3,114	3,054
Depreciation and amortization	325	302	645	589
Selling, general and administrative expenses	316	358	662	607
Other taxes	98	88	202	177
Total costs and expenses	25,564	24,743	48,548	46,932
Income from operations	1,369	960	1,730	2,116
Net interest and other financial income (costs)	(48)	(45)	(94)	(93)
Income before income taxes	1,321	915	1,636	2,023
Provision for income taxes	457	316	565	694
Net income	864	599	1,071	1,329
Less net income attributable to noncontrolling interests	9	6	17	11
Net income attributable to MPC	$ 855	$ 593	$ 1,054	$ 1,318
Basic:
Net income attributable to MPC per share	$ 2.97	$ 1.84	$ 3.63	$ 4.03
Weighted average shares outstanding (in shares)	287	322	290	326
Diluted:
Net income attributable to MPC per share	$ 2.95	$ 1.83	$ 3.60	$ 4.01
Weighted average shares outstanding (in shares)	289	324	292	328
Dividends paid (in USD per share)	$ 0.42	$ 0.35	$ 0.84	$ 0.70