Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 1,259	$ 839
Accounts receivable – net	1,208	976
Materials and supplies	289	218
Other current assets	101	134
Total current assets	2,857	2,167
Investments	3,671	3,707
Properties less accumulated depreciation of $12,267 and $12,031, respectively	31,787	31,653
Other assets	1,021	966
Total assets	39,336	38,493
Current liabilities:
Accounts payable	1,308	1,351
Income and other taxes	333	305
Other current liabilities	363	312
Current maturities of long-term debt	605	553
Total current liabilities	2,609	2,521
Long-term debt	14,449	13,287
Other liabilities	1,843	1,879
Deferred income taxes	7,281	7,165
Total liabilities	26,182	24,852
Stockholders’ equity:
Common stock $1.00 per share par value, 1,350,000,000 shares authorized; outstanding 234,873,651 and 240,162,790 shares, respectively, net of treasury shares	236	242
Additional paid-in capital	2,190	2,215
Accumulated other comprehensive loss	(388)	(402)
Retained income	11,116	11,586
Total stockholders’ equity	13,154	13,641
Total liabilities and stockholders’ equity	$ 39,336	$ 38,493