Summarized Consolidating Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Consolidated Income Statement
Revenue	$ 3,244	$ 3,046	$ 6,256	$ 6,009
Expense	2,247	2,106	4,520	4,189
Operating Income	997	940	1,736	1,820
Equity in Earnings of Subsidiaries	0	0	0	0
Interest (Expense) / Benefit	(135)	(140)	(275)	(287)
Other Income / (Expense) - Net	(12)	9	(5)	6
Earnings Before Income Taxes	850	809	1,456	1,539
Income Tax (Expense) / Benefit	(321)	(288)	(529)	(556)
Net Earnings	529	521	927	983
Total Comprehensive Earnings	544	538	958	1,017
CSX Corporation
Consolidated Income Statement
Revenue	0	0	0	0
Expense	(105)	(92)	(208)	(185)
Operating Income	105	92	208	185
Equity in Earnings of Subsidiaries	545	536	961	1,025
Interest (Expense) / Benefit	(126)	(128)	(256)	(262)
Other Income / (Expense) - Net	(3)	(2)	(5)	(3)
Earnings Before Income Taxes	521	498	908	945
Income Tax (Expense) / Benefit	8	23	19	38
Net Earnings	529	521	927	983
Total Comprehensive Earnings	544	538	958	1,017
CSX Transportation
Consolidated Income Statement
Revenue	3,223	3,027	6,215	5,973
Expense	2,360	2,213	4,753	4,430
Operating Income	863	814	1,462	1,543
Equity in Earnings of Subsidiaries	0	0	0	(1)
Interest (Expense) / Benefit	(14)	(15)	(28)	(32)
Other Income / (Expense) - Net	(10)	(3)	(4)	(1)
Earnings Before Income Taxes	839	796	1,430	1,509
Income Tax (Expense) / Benefit	(318)	(294)	(522)	(558)
Net Earnings	521	502	908	951
Total Comprehensive Earnings	522	504	915	953
Eliminations and Other
Consolidated Income Statement
Revenue	21	19	41	36
Expense	(8)	(15)	(25)	(56)
Operating Income	29	34	66	92
Equity in Earnings of Subsidiaries	(545)	(536)	(961)	(1,024)
Interest (Expense) / Benefit	5	3	9	7
Other Income / (Expense) - Net	1	14	4	10
Earnings Before Income Taxes	(510)	(485)	(882)	(915)
Income Tax (Expense) / Benefit	(11)	(17)	(26)	(36)
Net Earnings	(521)	(502)	(908)	(951)
Total Comprehensive Earnings	$ (522)	$ (504)	$ (915)	$ (953)