Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 671	$ 493
Receivables	2,553	1,917
Receivables from related parties	22	35
Inventories	324	361
Prepayments	111	96
Deferred tax assets, current	87	99
Other current assets	269	223
Total current assets	4,037	3,224
Equity method investments	1,319	1,383
Property, plant and equipment, less accumulated depreciation, depletion and amortization of $18,438 and $17,248	27,446	25,324
Goodwill	525	536
Other noncurrent assets	1,231	904
Total assets	34,558	31,371
Current liabilities:
Commercial paper	1,839	0
Accounts payable	2,335	1,864
Payables to related parties	44	18
Payroll and benefits payable	148	193
Accrued taxes	2,027	2,015
Other current liabilities	206	163
Long-term debt due within one year	183	141
Total current liabilities	6,782	4,394
Long-term debt	4,518	4,674
Deferred tax liabilities, noncurrent	2,495	2,544
Defined benefit postretirement plan obligations	817	789
Asset retirement obligations	1,516	1,510
Deferred credits and other liabilities, noncurrent	366	301
Total liabilities	16,494	14,212
Commitments and contingencies
Stockholders' Equity
Preferred stock no shares issued and outstanding (no par value, 26 million shares authorized)	0	0
Common stock issued - 770 million and 770 million shares (par value $1 per share, 1.1 billion shares authorized)	770	770
Common stock, securities exchangeable into common stock - no shares issued and outstanding (no par value, 29 million shares authorized)	0	0
Held in treasury, at cost - 64 million and 66 million shares	(2,607)	(2,716)
Additional paid-in capital	6,634	6,680
Retained earnings	13,688	12,788
Accumulated other comprehensive loss	(421)	(370)
Total equity of Marathon Oil's stockholders	18,064	17,152
Noncontrolling interest	0	7
Total equity	18,064	17,159
Total liabilities and stockholders' equity	$ 34,558	$ 31,371