Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013		Dec. 28, 2012		Dec. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive Earnings	$ 2,277		$ 1,802	[1]	$ 1,750	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(936)	[1]	(875)		(771)
Other Comprehensive Income (Loss):
Income (Loss) Before Reclassifications	534		(181)		(229)
Loss (Income) Reclassified to Net Earnings	109	[2]	87	[2]	74	[2]
Tax (Expense) Benefit	(230)		33		51
Other Comprehensive (Loss) Income, Net of Tax	413		(61)	[1]	(104)	[1]
Ending Balance	(523)	[1]	(936)	[1]	(875)
Pension and Other Post-Employment Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(851)		(799)		(711)
Other Comprehensive Income (Loss):
Income (Loss) Before Reclassifications	510		(172)		(216)
Loss (Income) Reclassified to Net Earnings	111	[2]	88	[2]	75	[2]
Tax (Expense) Benefit	(232)		32		53
Other Comprehensive (Loss) Income, Net of Tax	389		(52)	[1]	(88)	[1]
Ending Balance	(462)		(851)		(799)
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(85)	[3]	(76)	[3]	(60)	[3]
Other Comprehensive Income (Loss):
Income (Loss) Before Reclassifications	24	[3]	(9)	[3]	(13)	[3]
Loss (Income) Reclassified to Net Earnings	(2)	[2],[3]	(1)	[2],[3]	(1)	[2],[3]
Tax (Expense) Benefit	2	[3]	1	[3]	(2)	[3]
Other Comprehensive (Loss) Income, Net of Tax	24	[3]	(9)	[1],[3]	(16)	[1],[3]
Ending Balance	$ (61)	[3]	$ (85)	[3]	$ (76)	[3]

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

[2] Amounts reclassified to net earnings primarily relate to the amortization of actuarial losses and are included in labor and fringe on the consolidated income statements. See Note 8. Employee Benefit Plans for further information.

[3] Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified to net earnings are included in other income - net on the consolidated income statements.