CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and Cash Equivalents	$ 2,955	$ 3,129
Short-term Investments	2	2
Accounts Receivable - Net (Note 8)	957	912
Materials and Supplies	298	302
Other Current Assets	93	96
Total Current Assets	4,305	4,441
Properties	45,593	45,530
Accumulated Depreciation	(13,190)	(13,086)
Properties - Net	32,403	32,444
Investment in Affiliates and Other Companies	2,007	1,985
Right-of-Use Lease Asset	467	472
Other Long-term Assets	510	451
Total Assets	39,692	39,793
Current Liabilities:
Accounts Payable	859	809
Labor and Fringe Benefits Payable	419	482
Casualty, Environmental and Other Reserves (Note 4)	89	90
Current Maturities of Long-term Debt (Note 7)	41	401
Income and Other Taxes Payable	237	73
Other Current Liabilities	155	164
Total Current Liabilities	1,800	2,019
Casualty, Environmental and Other Reserves (Note 4)	229	224
Long-term Debt (Note 7)	16,306	16,304
Deferred Income Taxes - Net	7,226	7,168
Long-term Lease Liability	453	455
Other Long-term Liabilities	518	513
Total Liabilities	26,532	26,683
Shareholders' Equity:
Common Stock, $1 Par Value	757	763
Other Capital	448	409
Retained Earnings	12,476	12,527
Accumulated Other Comprehensive Loss (Note 11)	(530)	(598)
Non-controlling Minority Interest	9	9
Total Shareholders' Equity	13,160	13,110
Total Liabilities and Shareholders' Equity	$ 39,692	$ 39,793