CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and Cash Equivalents	$ 1,483	$ 1,353
Short-term Investments (Note 9)	2	83
Accounts Receivable - Net (Note 8)	1,400	1,393
Materials and Supplies	451	446
Other Current Assets	136	109
Total Current Assets	3,472	3,384
Properties	50,661	50,320
Accumulated Depreciation	(15,605)	(15,385)
Properties - Net	35,056	34,935
Investment in Affiliates and Other Companies	2,424	2,397
Right-of-Use Lease Asset	507	498
Goodwill and Other Intangible Assets - Net	520	506
Other Long-term Assets	716	688
Total Assets	42,695	42,408
Current Liabilities:
Accounts Payable	1,306	1,237
Labor and Fringe Benefits Payable	387	517
Casualty, Environmental and Other Reserves (Note 4)	140	144
Current Maturities of Long-term Debt (Note 7)	557	558
Income and Other Taxes Payable	382	525
Other Current Liabilities	252	243
Total Current Liabilities	3,024	3,224
Casualty, Environmental and Other Reserves (Note 4)	308	296
Long-term Debt (Note 7)	17,944	17,975
Deferred Income Taxes - Net	7,759	7,746
Long-term Lease Liability	501	491
Other Long-term Liabilities	557	543
Total Liabilities	30,093	30,275
Shareholders' Equity:
Common Stock, $1 Par Value	1,955	1,959
Other Capital	743	691
Retained Earnings	10,205	9,790
Accumulated Other Comprehensive Loss (Note 10)	(306)	(312)
Non-controlling Minority Interest	5	5
Total Shareholders' Equity	12,602	12,133
Total Liabilities and Shareholders' Equity	$ 42,695	$ 42,408