Summarized Consolidating Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Consolidated Income Statement
Revenue	$ 3,012	$ 3,019	$ 5,978	$ 5,829
Expense	2,069	2,093	4,179	4,130
Operating Income	943	926	1,799	1,699
Equity in Earnings of Subsidiaries	0	0	0	0
Interest (Expense) / Benefit	(139)	(134)	(283)	(274)
Other Income - Net	5	0	9	5
Earnings Before Income Taxes	809	792	1,525	1,430
Income Tax (Expense) / Benefit	(297)	(286)	(564)	(529)
Net Earnings	512	506	961	901
Total Comprehensive Earnings	529	519	987	925
CSX Corporation
Consolidated Income Statement
Revenue	0	0	0	0
Expense	(89)	(68)	(176)	(133)
Operating Income	89	68	176	133
Equity in Earnings of Subsidiaries	557	540	1,034	972
Interest (Expense) / Benefit	(125)	(121)	(255)	(247)
Other Income - Net	(1)	1	(2)	3
Earnings Before Income Taxes	520	488	953	861
Income Tax (Expense) / Benefit	(8)	18	8	40
Net Earnings	512	506	961	901
Total Comprehensive Earnings	529	519	987	925
CSX Transportation
Consolidated Income Statement
Revenue	2,995	3,003	5,945	5,797
Expense	2,192	2,222	4,421	4,364
Operating Income	803	781	1,524	1,433
Equity in Earnings of Subsidiaries	0	2	(1)	3
Interest (Expense) / Benefit	(17)	(22)	(36)	(45)
Other Income - Net	1	0	4	2
Earnings Before Income Taxes	787	761	1,491	1,393
Income Tax (Expense) / Benefit	(270)	(275)	(533)	(516)
Net Earnings	517	486	958	877
Total Comprehensive Earnings	518	485	956	877
Eliminations and Other
Consolidated Income Statement
Revenue	17	16	33	32
Expense	(34)	(61)	(66)	(101)
Operating Income	51	77	99	133
Equity in Earnings of Subsidiaries	(557)	(542)	(1,033)	(975)
Interest (Expense) / Benefit	3	9	8	18
Other Income - Net	5	(1)	7	0
Earnings Before Income Taxes	(498)	(457)	(919)	(824)
Income Tax (Expense) / Benefit	(19)	(29)	(39)	(53)
Net Earnings	(517)	(486)	(958)	(877)
Total Comprehensive Earnings	$ (518)	$ (485)	$ (956)	$ (877)