Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,964	$ 264
Receivables	2,222	2,134
Inventories	405	364
Other current assets	196	213
Total current assets	4,787	2,975
Equity method investments	1,223	1,201
Property, plant and equipment, less accumulated depreciation, depletion and amortization of $22,336 and $21,895	28,426	28,145
Goodwill	499	499
Other noncurrent assets	1,216	2,800
Total assets	36,151	35,620
Current liabilities:
Commercial paper	0	135
Accounts payable	2,382	2,206
Payroll and benefits payable	180	240
Accrued taxes	1,476	1,445
Other current liabilities	208	239
Long-term debt due within one year	68	68
Total current liabilities	4,314	4,333
Long-term debt	6,392	6,394
Deferred tax liabilities, noncurrent	2,517	2,492
Defined benefit postretirement plan obligations	660	604
Asset retirement obligations	2,062	2,009
Deferred credits and other liabilities, noncurrent	401	444
Total liabilities	16,346	16,276
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 or outstanding (no par value, 29 million shares authorized)	0	0
Held in treasury, at cost - 89 million and 73 million shares	(3,445)	(2,903)
Additional paid-in capital	6,599	6,592
Retained earnings	16,151	15,135
Accumulated other comprehensive loss	(270)	(250)
Total equity	19,805	19,344
Total liabilities and stockholders' equity	$ 36,151	$ 35,620