Summarized Consolidating Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Consolidated Income Statement
Revenue	$ 2,966	$ 2,810
Expense	2,110	2,037
Operating Income	856	773
Equity in Earnings of Subsidiaries	0	0
Interest (Expense) / Benefit	(144)	(140)
Other Income - Net	4	5
Earnings Before Income Taxes	716	638
Income Tax (Expense) / Benefit	(267)	(243)
Net Earnings	449	395
Total Comprehensive Earnings	458	406
CSX Corporation
Consolidated Income Statement
Revenue	0	0
Expense	(87)	(65)
Operating Income	87	65
Equity in Earnings of Subsidiaries	477	432
Interest (Expense) / Benefit	(130)	(126)
Other Income - Net	(1)	2
Earnings Before Income Taxes	433	373
Income Tax (Expense) / Benefit	16	22
Net Earnings	449	395
Total Comprehensive Earnings	458	406
CSX Transportation
Consolidated Income Statement
Revenue	2,950	2,794
Expense	2,229	2,142
Operating Income	721	652
Equity in Earnings of Subsidiaries	(1)	1
Interest (Expense) / Benefit	(19)	(23)
Other Income - Net	3	2
Earnings Before Income Taxes	704	632
Income Tax (Expense) / Benefit	(263)	(241)
Net Earnings	441	391
Total Comprehensive Earnings	438	392
Eliminations and Other
Consolidated Income Statement
Revenue	16	16
Expense	(32)	(40)
Operating Income	48	56
Equity in Earnings of Subsidiaries	(476)	(433)
Interest (Expense) / Benefit	5	9
Other Income - Net	2	1
Earnings Before Income Taxes	(421)	(367)
Income Tax (Expense) / Benefit	(20)	(24)
Net Earnings	(441)	(391)
Total Comprehensive Earnings	$ (438)	$ (392)