Summarized Consolidating Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Consolidated Income Statement
Revenue	$ 2,999	$ 2,894	$ 9,026	$ 8,872
Expense	2,145	2,040	6,334	6,219
Operating Income	854	854	2,692	2,653
Equity in Earnings of Subsidiaries	0	0	0	0
Interest (Expense) / Benefit	(136)	(138)	(423)	(421)
Other Income / (Expense) - Net	5	5	11	14
Earnings Before Income Taxes	723	721	2,280	2,246
Income Tax (Expense) / Benefit	(260)	(266)	(823)	(830)
Net Earnings	463	455	1,457	1,416
Total Comprehensive Earnings	479	471	1,507	1,458
CSX Corporation [Member]
Consolidated Income Statement
Revenue	0	0	0	0
Expense	(98)	(90)	(283)	(266)
Operating Income	98	90	283	266
Equity in Earnings of Subsidiaries	491	478	1,527	1,512
Interest (Expense) / Benefit	(125)	(126)	(387)	(381)
Other Income / (Expense) - Net	(2)	(1)	(5)	(3)
Earnings Before Income Taxes	462	441	1,418	1,394
Income Tax (Expense) / Benefit	1	14	39	22
Net Earnings	463	455	1,457	1,416
Total Comprehensive Earnings	479	471	1,507	1,458
CSX Transportation [Member]
Consolidated Income Statement
Revenue	2,979	2,878	8,970	8,823
Expense	2,247	2,166	6,677	6,587
Operating Income	732	712	2,293	2,236
Equity in Earnings of Subsidiaries	0	0	(1)	(1)
Interest (Expense) / Benefit	(15)	(17)	(47)	(53)
Other Income / (Expense) - Net	2	2	1	6
Earnings Before Income Taxes	719	697	2,246	2,188
Income Tax (Expense) / Benefit	(260)	(262)	(825)	(795)
Net Earnings	459	435	1,421	1,393
Total Comprehensive Earnings	461	437	1,425	1,393
Eliminations and Other [Member]
Consolidated Income Statement
Revenue	20	16	56	49
Expense	(4)	(36)	(60)	(102)
Operating Income	24	52	116	151
Equity in Earnings of Subsidiaries	(491)	(478)	(1,526)	(1,511)
Interest (Expense) / Benefit	4	5	11	13
Other Income / (Expense) - Net	5	4	15	11
Earnings Before Income Taxes	(458)	(417)	(1,384)	(1,336)
Income Tax (Expense) / Benefit	(1)	(18)	(37)	(57)
Net Earnings	(459)	(435)	(1,421)	(1,393)
Total Comprehensive Earnings	$ (461)	$ (437)	$ (1,425)	$ (1,393)