Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014		Mar. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Comprehensive Earnings	$ 414		$ 479
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 27, 2013, Net of Tax	(523)
Other Comprehensive Income
Amounts Reclassified to Net Earnings	23	[1]
Tax Expense	(7)
Total Other Comprehensive Income	16
Balance March 28, 2014, Net of Tax	(507)
Pension and Other Post-Employment Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 27, 2013, Net of Tax	(462)
Other Comprehensive Income
Amounts Reclassified to Net Earnings	15	[1]
Tax Expense	(6)
Total Other Comprehensive Income	9
Balance March 28, 2014, Net of Tax	(453)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 27, 2013, Net of Tax	(61)	[2]
Other Comprehensive Income
Amounts Reclassified to Net Earnings	8	[1],[2]
Tax Expense	(1)	[2]
Total Other Comprehensive Income	7	[2]
Balance March 28, 2014, Net of Tax	$ (54)	[2]

[1] 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 6. Employee Benefit Plans for further information.

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