Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,854	$ 2,292
Receivables, less allowance for doubtful accounts of $10 and $9	5,271	5,559
Inventories	5,608	4,689
Other current assets	154	197
Total current assets	12,887	12,737
Equity method investments	862	463
Property, plant and equipment, net	15,999	13,921
Goodwill	1,537	938
Other noncurrent assets	420	326
Total assets	31,705	28,385
Current liabilities:
Accounts payable	8,726	8,234
Payroll and benefits payable	345	406
Consumer excise taxes payable	365	373
Accrued taxes	586	513
Long-term debt due within one year	26	23
Other current liabilities	324	275
Total current liabilities	10,372	9,824
Long-term debt	6,238	3,373
Deferred income taxes	2,165	2,304
Defined benefit postretirement plan obligations	937	771
Deferred credits and other liabilities	727	781
Total liabilities	20,439	17,053
Commitments and contingencies (see Note 22)
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 - 82 million and 65 million shares	(5,616)	(4,155)
Additional paid-in capital	9,833	9,768
Retained earnings	6,856	5,507
Accumulated other comprehensive loss	(228)	(204)
Total MPC stockholders’ equity	10,849	10,920
Noncontrolling interests	417	412
Total equity	11,266	11,332
Total liabilities and equity	$ 31,705	$ 28,385