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Component: (Network and Table)
Network
2408409 - Disclosure - Employee Benefit Plans - Schedule of Net Benefit Expense (Details)
(http://www.csx.com/role/EmployeeBenefitPlansScheduleOfNetBenefitExpenseDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000277948 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2015-12-26 - 2016-12-30
2014-12-27 - 2015-12-25
2013-12-28 - 2014-12-26
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension PlansPost-retirement Medical PlanPension PlansPost-retirement Medical PlanPension PlansPost-retirement Medical Plan
Components of expense/ (income) related to net benefit expense [Abstract]
 
 
 
 
 
 
Service Cost
48,000,000  
2,000,000  
45,000,000  
2,000,000  
44,000,000  
3,000,000  
Interest Cost
119,000,000  
12,000,000  
116,000,000  
12,000,000  
123,000,000  
13,000,000  
Expected Return on Plan Assets
(157,000,000) 
0  
(162,000,000) 
0  
(166,000,000) 
0  
Amortization of Net Loss
48,000,000  
3,000,000  
70,000,000  
4,000,000  
57,000,000  
5,000,000  
Amortization of Prior Service Cost
0  
0  
0  
(1,000,000) 
0  
(1,000,000) 
Net Periodic Benefit Expense
58,000,000  
 
17,000,000  
 
69,000,000  
 
17,000,000  
 
58,000,000  
 
20,000,000  
 
Special Termination Benefits - Workforce Reduction Program/Curtailment
0  
0  
7,000,000  
0  
27,000,000  
8,000,000  
Settlement Gain
(1,000,000) 
0  
(2,000,000) 
0  
(1,000,000) 
0  
Total Expense
57,000,000  
 
17,000,000  
 
74,000,000  
 
17,000,000  
 
84,000,000  
 
28,000,000