Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,572	$ 2,398
Short-term Investments	925	0
Receivables, less reserve of $4 and $3	1,195	1,729
Inventories	336	357
Other current assets	102	109
Total current assets	4,130	4,593
Equity method investments	1,045	1,113
Property, plant and equipment, less accumulated depreciation, depletion and amortization of $23,395 and $21,884	29,121	29,040
Goodwill	459	459
Other noncurrent assets	1,015	806
Total assets	35,770	36,011
Current liabilities:
Accounts payable	1,507	2,545
Payroll and benefits payable	119	191
Accrued taxes	156	285
Other current liabilities	235	290
Long-term debt due within one year	1,035	1,068
Total current liabilities	3,052	4,379
Long-term debt	7,321	5,323
Deferred tax liabilities, noncurrent	2,531	2,486
Defined benefit postretirement plan obligations	438	598
Asset retirement obligations	1,963	1,917
Deferred credits and other liabilities, noncurrent	247	288
Total liabilities	$ 15,552	$ 14,991
Commitments and contingencies
Stockholders' Equity
Preferred stock - no shares issued or outstanding (no par value, 26 million shares authorized)	$ 0	$ 0
Common stock issued - 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 or outstanding (no par value, 29 million shares authorized)	0	0
Common stock, held in treasury, at cost - 93 million and 95 million shares	(3,555)	(3,642)
Additional paid-in capital	6,484	6,531
Retained earnings	16,691	17,638
Accumulated other comprehensive loss	(172)	(277)
Total stockholders' equity	20,218	21,020
Total liabilities and stockholders' equity	$ 35,770	$ 36,011