CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 28, 2012	Dec. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Current Assets
Cash and Cash Equivalents	$ 693	$ 783	$ 580	$ 1,292
Short-term Investments	35	523
Accounts Receivable - Net (Note 1)	1,163	1,129
Materials and Supplies	264	240
Deferred Income Taxes	134	182
Other Current Assets	104	78
Total Current Assets	2,393	2,935
Properties	35,020	33,704
Accumulated Depreciation	(9,088)	(8,730)
Properties - Net	25,932	24,974
Other Long-term Assets	410	393
Total Assets	29,930	29,473
Current Liabilities
Accounts Payable	1,197	1,147
Labor and Fringe Benefits Payable	416	541
Casualty, Environmental and Other Reserves (Note 4)	169	167
Current Maturities of Long-term Debt (Note 7)	806	507
Income and Other Taxes Payable	261	129
Other Current Liabilities	172	196
Total Current Liabilities	3,021	2,687
Casualty, Environmental and Other Reserves (Note 4)	319	352
Long-term Debt (Note 7)	8,257	8,734
Deferred Income Taxes	8,018	7,601
Other Long-term Liabilities	1,284	1,631
Total Liabilities	20,899	21,005
Common Stock $1 Par Value	1,031	1,049
Other Capital	20	6
Retained Earnings	8,798	8,275
Accumulated Other Comprehensive Loss (Note 1)	(833)	(875)
Noncontrolling Interest	15	13
Total Shareholders' Equity	9,031	8,468
Total Liabilities and Shareholders' Equity	29,930	29,473
Investments in Conrail [Member]
Current Assets
Investment in Affiliates and Joint Ventures	693	678
Affiliates and Other Companies [Member]
Current Assets
Investment in Affiliates and Joint Ventures	$ 502	$ 493