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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Summary of Participants In order to perform this valuation, the actuaries are provided with the details of the population covered at the beginning of the year, summarized in the table below, and projects that population forward to the end of the year.
Summary of Participants as of
January 1, 2020
 Pension PlansPost-retirement Medical Plan
Active Employees3,373 779 
Retirees and Beneficiaries11,841 2,282 
Other(a)
3,854 — 
Total19,068 3,061 
(a) For pension plans, the other category consists mostly of terminated but vested former employees.
Schedule of Future Expected Benefit Payments Future expected benefit payments are as follows:
 Expected Cash Flows
(Dollars in Millions)Pension BenefitsPost-retirement Benefits
2021$196 $17 
2022188 10 
2023187 
2024186 
2025185 
2026-2030898 28 
Total$1,840 $80 
Schedule of Allocation of Plan Assets The distribution of pension plan assets as of the measurement date is shown in the table below, and these assets are reported net of pension liabilities on the balance sheet.
 December 2020December 2019
  Percent of Percent of
(Dollars in Millions)AmountTotal AssetsAmountTotal Assets
Growth-Oriented$1,816 61 %$2,027 72 %
Equity1,324 44 1,772 63 
Fixed Income271 229 
Cash and Cash Equivalents221 26 
Immunizing1,184 39 798 28 
Fixed Income1,018 34 595 21 
Cash and Cash Equivalents166 203 
Total$3,000 100 %$2,825 100 %
Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets
Changes in benefit obligation and the fair value of plan assets for the 2020 and 2019 calendar plan years are as follows:

 Pension BenefitsPost-retirement Benefits
 Plan YearPlan YearPlan YearPlan Year
(Dollars in Millions)2020201920202019
Actuarial Present Value of Benefit Obligation    
Accumulated Benefit Obligation$3,134 $2,963 N/AN/A
Projected Benefit Obligation3,257 3,122 $96 $117 
Change in Projected Benefit Obligation:    
Projected Benefit Obligation at Beginning of Plan Year
$3,122 $2,758 $117 $118 
Service Cost (a)
46 34 1 
Interest Cost82 103 5 
Plan Participants' Contributions — 6 
Actuarial Loss (Gain) 197 418 (11)22 
Benefits Paid(190)(191)(22)(33)
Benefit Obligation at End of Plan Year$3,257 $3,122 $96 $117 
Change in Plan Assets:    
Fair Value of Plan Assets at Beginning of Plan Year$2,825 $2,431 $ $— 
Actual Return on Plan Assets345 568  — 
Non-qualified Employer Contributions20 17 16 26 
Plan Participants' Contributions — 6 
Benefits Paid(190)(191)(22)(33)
Fair Value of Plan Assets at End of Plan Year3,000 2,825  — 
Funded Status at End of Plan Year$(257)$(297)$(96)$(117)
(a)Service cost for each 2020 and 2019 includes capitalized service costs of $3 million.
Schedule of Amount Recognized in Balance Sheet Amounts related to pension and post-retirement benefits recorded in other long-term assets, labor and fringe benefits payable and other long-term liabilities on the balance sheet are as follows:
 Pension BenefitsPost-retirement Benefits
 DecemberDecemberDecemberDecember
(Dollars in Millions)2020201920202019
Amounts Recorded in Consolidated   
Balance Sheets:    
Long-term Assets (a)
$29 $25 $ $— 
Current Liabilities(16)(17)(17)(20)
Long-term Liabilities(270)(305)(79)(97)
Net Amount Recognized in    
Consolidated Balance Sheets$(257)$(297)$(96)$(117)
(a)Long-term assets as of December 2020 and 2019 relate to qualified pension plans where assets exceed projected benefit obligations.
Schedule of Benefit Obligations in Excess of Plan Assets At December 2020, the status of CSX plans with a net liability only is disclosed below. The total fair value of all plan assets as of December 2020 was $3.0 billion, which includes the qualified pension plans with net assets.
Aggregate
(Dollars in Millions)Fair ValueAggregate
Benefit Obligations in Excess of Plan Assetsof Plan AssetsBenefit Obligation
Projected Benefit Obligation$2,884 $(3,170)
Accumulated Benefit Obligation2,884 (264)
Schedule of Net Benefit Expense The following table describes the components of expense/(income) related to net benefit expense recorded on the income statement.
Pension Benefits
Fiscal Years
Post-retirement Benefits
Fiscal Years
(Dollars in Millions)202020192018202020192018
Service Cost Included in Labor and Fringe$43 $31 $32 $1 $$
Interest Cost82 103 92 5 
Expected Return on Plan Assets(176)(171)(176) — — 
Amortization of Net Loss54 30 41 1 — — 
Amortization of Prior Service Cost — — (7)(7)(2)
Total (Income)/ Expense Included in Other Income - Net(40)(38)(43)(1)(5)
Net Periodic Benefit Cost/(Credit) $3 $(7)$(11)$ $(4)$
Settlement Gain(1)— (1) — — 
Total Periodic Benefit Cost/(Credit)$2 $(7)$(12)$ $(4)$
Schedule of Pre-tax Change in Other Comprehensive Loss (Income)
The following table shows the pre-tax change in other comprehensive loss (income) attributable to certain components of net benefit expense and the change in benefit obligation for CSX for pension and other post-employment benefits.

(Dollars in Millions)Pension BenefitsPost-retirement Benefits
Components of Other ComprehensiveDecemberDecemberDecemberDecember
Loss (Income)2020201920202019
Recognized in the Balance Sheet    
Losses (Gains) $28 $21 $(11)$22 
Expense (Income) Recognized in the Income Statement
Amortization of Net Losses$54 $30 $1 $— 
Settlement Gain(1)—  — 
Amortization of Prior Service Costs
 — (7)(7)
Schedule of Weighted-Average Assumptions Used The weighted averages of assumptions used by the Company to value its pension and post-retirement obligations were as follows:
 Pension BenefitsPost-retirement Benefits
 2020201920202019
Expected Long-term Return on Plan Assets:    
Benefit Cost for Current Plan Year6.75 %6.75 %N/AN/A
Benefit Cost for Subsequent Plan Year6.75 %6.75 %N/AN/A
Discount Rates:    
Benefit Cost for Plan Year
Service Cost for Plan Year3.32 %4.40 %2.93 %4.14 %
Interest Cost for Plan Year2.69 %3.87 %2.43 %3.51 %
Benefit Obligation at End of Plan Year2.43 %3.13 %2.07 %2.87 %
Salary Scale Inflation4.60 %4.60 %N/AN/A
Cash Balance Plan Interest Credit Rate3.75 %3.75 %N/AN/A