CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	[1]
Current Assets:
Cash and Cash Equivalents	$ 3,129	$ 958
Short-term Investments	2	996
Accounts Receivable - Net (Note 11)	912	986
Materials and Supplies	302	261
Other Current Assets	96	77
Total Current Assets	4,441	3,278
Properties	45,530	45,100
Accumulated Depreciation	(13,086)	(12,932)
Properties - Net (Note 6)	32,444	32,168
Investment in Affiliates and Other Companies (Note 15)	1,985	1,879
Right of Use Lease Asset (Note 7)	472	532
Other Long-term Assets	451	400
Total Assets	39,793	38,257
Current Liabilities:
Accounts Payable	809	1,043
Labor and Fringe Benefits Payable	482	489
Casualty, Environmental and Other Reserves (Note 5)	90	100
Current Maturities of Long-term Debt (Note 10)	401	245
Income and Other Taxes Payable	73	69
Other Current Liabilities	164	205
Total Current Liabilities	2,019	2,151
Casualty, Environmental and Other Reserves (Note 5)	224	205
Long-term Debt (Note 9)	16,304	15,993
Deferred Income Taxes - Net (Note 12)	7,168	6,961
Long-term Lease Liability (Note 7)	455	493
Other Long-term Liabilities	513	591
Total Liabilities	26,683	26,394
Shareholders' Equity:
Common Stock, $1 Par Value (Note 3)	763	773
Other Capital	409	346
Retained Earnings (Note 1)	12,527	11,404
Accumulated Other Comprehensive Loss (Note 16)	(598)	(675)
Non-controlling Minority Interest	9	15
Total Shareholders' Equity	13,110	11,863
Total Liabilities and Shareholders' Equity	$ 39,793	$ 38,257

[1] Certain prior year data has been reclassified to conform to the current presentation.