Summarized Consolidating Financial Data (Income Statements) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 30, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 30, 2011	Sep. 30, 2011	Jul. 01, 2011	Apr. 01, 2011	Dec. 27, 2013		Dec. 28, 2012		Dec. 30, 2011
Consolidated Income Statement
Revenue	$ 3,032	$ 2,985	$ 3,046	$ 2,963	$ 2,895	$ 2,864	$ 2,986	$ 3,018	$ 2,993	$ 2,962	$ 3,013	$ 2,827	$ 12,026		$ 11,763	[1]	$ 11,795	[1]
Operating Expenses													8,553		8,299	[1]	8,325	[1]
Operating Income	813	840	940	880	815	824	917	908	883	877	920	790	3,473		3,464	[1]	3,470	[1]
Equity in Earnings of Subsidiaries													0		0		0
Interest Expense													(562)		(566)	[1]	(552)	[1]
Other Income - Net													11		73	[1]	22	[1]
Earnings Before Income Taxes													2,922		2,971	[1]	2,940	[1]
Income Tax Benefit (Expense)													(1,058)		(1,108)	[1]	(1,086)	[1]
Net Earnings	426	455	521	462	449	437	496	481	483	463	502	406	1,864		1,863	[1]	1,854	[1]
Comprehensive Earnings													2,277		1,802	[1]	1,750	[1]
CSX Corporation
Consolidated Income Statement
Revenue													0		0		0
Operating Expenses													(371)		(355)		(278)
Operating Income													371		355		278
Equity in Earnings of Subsidiaries													1,964		1,992		1,979
Interest Expense													(516)		(513)		(496)
Other Income - Net													(7)		(3)		2
Earnings Before Income Taxes													1,812		1,831		1,763
Income Tax Benefit (Expense)													52		32		91
Net Earnings													1,864		1,863		1,854
Comprehensive Earnings													2,277		1,802		1,750
CSX Transportation
Consolidated Income Statement
Revenue													11,950		11,696		11,728
Operating Expenses													9,091		8,779		8,679
Operating Income													2,859		2,917		3,049
Equity in Earnings of Subsidiaries													(1)		(2)		3
Interest Expense													(62)		(70)		(83)
Other Income - Net													(2)		61		19
Earnings Before Income Taxes													2,794		2,906		2,988
Income Tax Benefit (Expense)													(1,028)		(1,065)		(1,101)
Net Earnings													1,766		1,841		1,887
Comprehensive Earnings													1,825		1,818		1,873
Eliminations and Other
Consolidated Income Statement
Revenue													76		67		67
Operating Expenses													(167)		(125)		(76)
Operating Income													243		192		143
Equity in Earnings of Subsidiaries													(1,963)		(1,990)		(1,982)
Interest Expense													16		17		27
Other Income - Net													20		15		1
Earnings Before Income Taxes													(1,684)		(1,766)		(1,811)
Income Tax Benefit (Expense)													(82)		(75)		(76)
Net Earnings													(1,766)		(1,841)		(1,887)
Comprehensive Earnings													(1,825)		(1,818)		(1,873)
Retained Earnings
Consolidated Income Statement
Net Earnings													$ 1,864	[1]	$ 1,863	[1]	$ 1,854	[1]

[1] See the revision of prior period financial statements in Note 1. Nature of Operations and Significant Accounting Policies.