Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 1,571	$ 839
Accounts receivable – net	1,070	976
Materials and supplies	264	218
Other current assets	110	134
Total current assets	3,015	2,167
Investments	3,697	3,707
Properties less accumulated depreciation of $12,123 and $12,031, respectively	31,657	31,653
Other assets	992	966
Total assets	39,361	38,493
Current liabilities:
Accounts payable	1,181	1,351
Income and other taxes	443	305
Other current liabilities	370	312
Current maturities of long-term debt	1,153	553
Total current liabilities	3,147	2,521
Long-term debt	13,691	13,287
Other liabilities	1,845	1,879
Deferred income taxes	7,217	7,165
Total liabilities	25,900	24,852
Stockholders’ equity:
Common stock $1.00 per share par value, 1,350,000,000 shares authorized; outstanding 238,332,514 and 240,162,790 shares, respectively, net of treasury shares	240	242
Additional paid-in capital	2,203	2,215
Accumulated other comprehensive loss	(394)	(402)
Retained income	11,412	11,586
Total stockholders’ equity	13,461	13,641
Total liabilities and stockholders’ equity	$ 39,361	$ 38,493