Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,143	$ 580
Accounts receivable – net	822	920
Materials and supplies	257	244
Other current assets	128	337
Total current assets	2,350	2,081
Investments	3,590	3,428
Properties less accumulated depreciation of $11,823 and $11,982, respectively	31,217	31,614
Other assets	805	800
Total assets	37,962	37,923
Current liabilities:
Accounts payable	1,268	1,428
Income and other taxes	239	229
Other current liabilities	343	327
Current maturities of long-term debt	85	316
Total current liabilities	1,935	2,300
Long-term debt	12,612	11,880
Other liabilities	1,680	1,744
Deferred income taxes	6,874	6,815
Total liabilities	23,101	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	256	259
Additional paid-in capital	2,217	2,209
Accumulated other comprehensive loss	(475)	(491)
Retained income	12,863	13,207
Total stockholders’ equity	14,861	15,184
Total liabilities and stockholders’ equity	$ 37,962	$ 37,923