Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,490	$ 1,221
Receivables, less reserve of $6 and $4	877	912
Inventories	227	313
Other current assets	71	144
Total current assets	3,665	2,590
Equity method investments	931	1,003
Property, plant and equipment, less accumulated depreciation, depletion and amortization of $22,214 and $23,260	25,718	27,061
Goodwill	115	115
Other noncurrent assets	665	1,542
Total assets	31,094	32,311
Current liabilities:
Accounts payable	1,078	1,313
Payroll and benefits payable	129	133
Accrued taxes	94	132
Other current liabilities	253	150
Long-term debt due within one year	686	1
Total current liabilities	2,240	1,729
Long-term debt	6,589	7,276
Deferred tax liabilities	2,438	2,441
Defined benefit postretirement plan obligations	345	403
Asset retirement obligations	1,697	1,601
Deferred credit and other liabilities	244	308
Total liabilities	13,553	13,758
Commitments and contingencies
Stockholders’ Equity
Preferred stock no shares issued or outstanding (no par value, 26 million shares authorized)	0	0
Common stock issued - 937 million and 770 million shares (par value $1 per share, 1.1 billion shares authorized)	937	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 – 90 million and 93 million shares	(3,431)	(3,554)
Additional paid-in capital	7,446	6,498
Retained earnings	12,672	14,974
Accumulated other comprehensive loss	(83)	(135)
Total stockholders equity	17,541	18,553
Total liabilities and stockholders equity	$ 31,094	$ 32,311