Consolidated Balance Sheets (Unaudited) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 242	$ 827
Short-term investments	152	283
Accounts receivable, net	1,029	807
Materials and supplies	212	169
Deferred income taxes	160	145
Other current assets	30	240
Total current assets	1,825	2,471
Investments	2,240	2,193
Properties less accumulated depreciation of $9,351 and $9,262, respectively	23,978	23,231
Other assets	268	304
Total assets	28,311	28,199
Liabilities and stockholders' equity
Accounts payable	1,329	1,181
Short-term debt	0	100
Income and other taxes	221	199
Other current liabilities	331	244
Current maturities of long-term debt	55	358
Total current liabilities	1,936	2,082
Long-term debt	6,782	6,567
Other liabilities	1,788	1,793
Deferred income taxes	7,550	7,088
Total liabilities	18,056	17,530
Stockholders' equity:
Common stock $1.00 per share par value, 1,350,000,000 shares authorized; outstanding 336,106,217 and 357,362,604 shares, respectively, net of treasury shares	337	358
Additional paid-in capital	1,912	1,892
Accumulated other comprehensive loss	(753)	(805)
Retained income	8,759	9,224
Total stockholders' equity	10,255	10,669
Total liabilities and stockholders' equity	$ 28,311	$ 28,199