Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,359	$ 580
Accounts receivable – net	883	920
Materials and supplies	247	244
Other current assets	90	337
Total current assets	2,579	2,081
Investments	3,566	3,428
Properties less accumulated depreciation of $11,823 and $11,982, respectively	31,239	31,614
Other assets	795	800
Total assets	38,179	37,923
Current liabilities:
Accounts payable	1,273	1,428
Income and other taxes	257	229
Other current liabilities	386	327
Current maturities of long-term debt	89	316
Total current liabilities	2,005	2,300
Long-term debt	12,634	11,880
Other liabilities	1,701	1,744
Deferred income taxes	6,898	6,815
Total liabilities	23,238	22,739
Stockholders’ equity:
Common stock $1.00 per share par value, 1,350,000,000 shares authorized; outstanding 256,179,130 and 257,904,956 shares, respectively, net of treasury shares	255	259
Additional paid-in capital	2,246	2,209
Accumulated other comprehensive loss	(471)	(491)
Retained income	12,911	13,207
Total stockholders’ equity	14,941	15,184
Total liabilities and stockholders’ equity	$ 38,179	$ 37,923