Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,125	$ 2,292
Receivables, less allowance for doubtful accounts of $9 and $9	5,725	5,559
Inventories	5,621	4,689
Other current assets	125	197
Total current assets	13,596	12,737
Equity method investments	690	463
Property, plant and equipment, net	13,850	13,921
Goodwill	937	938
Other noncurrent assets	303	326
Total assets	29,376	28,385
Current liabilities:
Accounts payable	8,934	8,234
Payroll and benefits payable	286	406
Consumer excise taxes payable	381	373
Accrued taxes	909	513
Long-term debt due within one year	26	23
Other current liabilities	519	275
Total current liabilities	11,055	9,824
Long-term debt	3,612	3,373
Deferred income taxes	2,170	2,304
Defined benefit postretirement plan obligations	906	771
Deferred credits and other liabilities	596	781
Total liabilities	18,339	17,053
Commitments and contingencies (see Note 20)
MPC stockholders’ equity:
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)	0	0
Common stock:
Issued - 363 million and 362 million shares (par value $0.01 per share, 1 billion shares authorized)	4	4
Held in treasury, at cost - 78 million and 65 million shares	(5,313)	(4,155)
Additional paid-in capital	9,822	9,768
Retained earnings	6,325	5,507
Accumulated other comprehensive loss	(218)	(204)
Total MPC stockholders’ equity	10,620	10,920
Noncontrolling interests	417	412
Total equity	11,037	11,332
Total liabilities and equity	$ 29,376	$ 28,385