Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	[1]	$ 11,839	$ 415
Short-term investments		5,418	0
Receivables, less allowance for doubtful accounts of $44 and $18, respectively		9,771	5,760
Inventories		8,879	7,999
Other current assets		2,685	2,724
Assets held for sale		0	11,389
Total current assets		38,592	28,287
Equity method investments		5,424	5,422
Property, plant and equipment, net		37,996	39,035
Goodwill		8,256	8,256
Right of use assets		1,500	1,521
Other noncurrent assets		2,532	2,637
Total assets		94,300	85,158
Current liabilities:
Accounts payable		12,170	7,803
Payroll and benefits payable		651	732
Accrued taxes		5,219	1,105
Debt due within one year		70	2,854
Operating lease liabilities		473	497
Other current liabilities		929	822
Liabilities held for sale		0	1,850
Total current liabilities		19,512	15,663
Long-term debt		28,250	28,730
Deferred income taxes		5,704	6,203
Defined benefit postretirement plan obligations		1,850	2,121
Long-term operating lease liabilities		1,020	1,014
Deferred credits and other liabilities		1,271	1,207
Total liabilities		57,607	54,938
Commitments and contingencies (see Note 24)
Redeemable noncontrolling interest		968	968
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 – 983 million and 980 million shares (par value $0.01 per share, 2 billion shares authorized)		10	10
Held in treasury, at cost – 345 million and 329 million shares		(16,147)	(15,157)
Additional paid-in capital		33,238	33,208
Retained earnings		12,160	4,650
Accumulated other comprehensive loss		(340)	(512)
Total MPC stockholders’ equity		28,921	22,199
Noncontrolling interests		6,804	7,053
Total equity		35,725	29,252
Total liabilities, redeemable noncontrolling interest and equity		$ 94,300	$ 85,158

[1] Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.