CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 29, 2013	Dec. 28, 2012	Mar. 30, 2012	Dec. 30, 2011
Current Assets
Cash and Cash Equivalents	$ 705	$ 784	$ 627	$ 783
Short-term Investments	367	587
Accounts Receivable - Net (Note 1)	976	962
Materials and Supplies	283	274
Deferred Income Taxes	133	119
Other Current Assets	103	75
Total Current Assets	2,567	2,801
Properties	35,674	35,279
Accumulated Depreciation	(9,386)	(9,229)
Properties - Net	26,288	26,050
Other Long-term Assets	516	514
Total Assets	30,586	30,571
Current Liabilities
Accounts Payable	1,043	1,014
Labor and Fringe Benefits Payable	376	468
Casualty, Environmental and Other Reserves (Note 4)	139	140
Current Maturities of Long-term Debt (Note 7)	572	780
Income and Other Taxes Payable	206	85
Other Current Liabilities	138	140
Total Current Liabilities	2,474	2,627
Casualty, Environmental and Other Reserves (Note 4)	323	337
Long-term Debt (Note 7)	8,846	9,052
Deferred Income Taxes	8,202	8,096
Other Long-term Liabilities	1,393	1,457
Total Liabilities	21,238	21,569
Common Stock $1 Par Value	1,022	1,020
Other Capital	36	28
Retained Earnings	9,191	8,876
Accumulated Other Comprehensive Loss (Note 10)	(919)	(936)
Noncontrolling Interest	18	14
Total Shareholders' Equity	9,348	9,002
Total Liabilities and Shareholders' Equity	30,586	30,571
Investments in Conrail [Member]
Current Assets
Investment in Affiliates and Joint Ventures	703	695
Affiliates and Other Companies [Member]
Current Assets
Investment in Affiliates and Joint Ventures	$ 512	$ 511