Other Long-term Assets and Other Long-term Liabilities (Other Long-Term Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 30, 2011		Dec. 31, 2010
Other Assets, Noncurrent [Abstract]
Debt Issuance Costs	$ 169	[1]	$ 170	[1]
Available-for-sale Securities, Noncurrent	105		69
Goodwill	64	[2]	64	[2]
Other	55		50
Total Other Long-term Assets	$ 393		$ 353

[1] Majority of debt issuance costs relate to premium paid in March 2010 for exchange of debt.

[2] Goodwill related to subsidiaries of CSXT, primarily P&L Transportation, Inc., represents purchase price in excess of fair value.