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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018
| Pension Plans |  | Post-retirement Medical Plan
Active Employees | 3,566 |  |  | 660 |
Retirees and Beneficiaries | 12,081 |  |  | 9,030 |
Other(a) | 4,262 |  |  | 23 |
Total | 19,909 |  |  | 9,713 |
(a) For pension plans, the other category consists mostly of terminated but vested former employees. For post-retirement plans, the other category consists of employees on long-term disability that have not yet retired.
Schedule of Future Expected Benefit Payments | Future expected benefit payments are as follows:
| Expected Cash Flows
(Dollars in Millions) | Pension Benefits |  | Post-retirement Benefits
2019 | $ | 192 |  |  | $ | 34 |
2020 | 186 |  |  | 13 |
2021 | 185 |  |  | 11 |
2022 | 183 |  |  | 10 |
2023 | 180 |  |  | 9 |
2024-2028 | 886 |  |  | 32 |
Total | $ | 1,812 |  |  | $ | 109 |
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 2018 |  | December 2017
|  |  | Percent of |  |  |  | Percent of
(Dollars in Millions) | Amount |  | Total Assets |  | Amount |  | Total Assets
Equity | $ | 1,698 |  |  | 70 | % |  | $ | 2,060 |  |  | 73 | %
Fixed Income | 704 |  |  | 29 |  |  | 729 |  |  | 26 |
Cash and Cash Equivalents | 29 |  |  | 1 |  |  | 44 |  |  | 1 |
Total | $ | 2,431 |  |  | 100 | % |  | $ | 2,833 |  |  | 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 2018 and 2017 calendar plan years are as follows:
| Pension Benefits |  | Post-retirement Benefits
| Plan Year |  | Plan Year |  | Plan Year |  | Plan Year
(Dollars in Millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Actuarial Present Value of Benefit Obligation |  |  |  |  |  |  |
Accumulated Benefit Obligation | $ | 2,623 |  |  | $ | 2,873 |  |  | N/A |  |  | N/A |
Projected Benefit Obligation | 2,758 |  |  | 3,002 |  |  | $ | 118 |  |  | $ | 250 |
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |
Projected Benefit Obligation at Beginning of Plan Year | $ | 3,002 |  |  | $ | 2,871 |  |  | $ | 250 |  |  | $ | 274 |
Service Cost (a) | 36 |  |  | 36 |  |  | 2 |  |  | 2 |
Interest Cost | 92 |  |  | 92 |  |  | 7 |  |  | 7 |
Plan Participants' Contributions | — |  |  | — |  |  | 5 |  |  | 7 |
Workforce Reduction Program/Curtailment | — |  |  | 58 |  |  | — |  |  | 13 |
Post-retirement Plan Amendment | — |  |  | — |  |  | (102 | ) |  | — |
Actuarial (Gain) Loss | (173 | ) |  | 163 |  |  | (10 | ) |  | (17 | )
Benefits Paid | (199 | ) |  | (218 | ) |  | (34 | ) |  | (36 | )
Benefit Obligation at End of Plan Year | $ | 2,758 |  |  | $ | 3,002 |  |  | $ | 118 |  |  | $ | 250 |
Change in Plan Assets: |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets at Beginning of Plan Year | $ | 2,833 |  |  | $ | 2,539 |  |  | $ | — |  |  | $ | — |
Actual Return on Plan Assets (Loss) Gain | (220 | ) |  | 467 |  |  | — |  |  | — |
Non-qualified Employer Contributions | 17 |  |  | 45 |  |  | 30 |  |  | 29 |
Plan Participants' Contributions | — |  |  | — |  |  | 4 |  |  | 7 |
Benefits Paid | (199 | ) |  | (218 | ) |  | (34 | ) |  | (36 | )
Fair Value of Plan Assets at End of Plan Year | 2,431 |  |  | 2,833 |  |  | — |  |  | — |
Funded Status at End of Plan Year | $ | (327 | ) |  | $ | (169 | ) |  | $ | (118 | ) |  | $ | (250 | )
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 Benefits |  | Post-retirement Benefits
| December |  | December |  | December |  | December
(Dollars in Millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Amounts Recorded in Consolidated |  |  |  |  |  |  |
Balance Sheets: |  |  |  |  |  |  |
Long-term Assets (a) | $ | 13 |  |  | $ | 57 |  |  | $ | — |  |  | $ | — |
Current Liabilities | (16 | ) |  | (15 | ) |  | (34 | ) |  | (38 | )
Long-term Liabilities | (324 | ) |  | (211 | ) |  | (84 | ) |  | (212 | )
Net Amount Recognized in |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheets | $ | (327 | ) |  | $ | (169 | ) |  | $ | (118 | ) |  | $ | (250 | )
(a) | Long-term assets as of December 2018 and 2017 relate to qualified pension plans where assets exceed projected benefit obligations.
Benefit Obligations in Excess of Plan Assets | At December 2018, the status of CSX plans with a net liability only is disclosed below. The total fair value of all plan assets as of December 2018 was $2.4 billion, which includes the qualified pension plans with net assets.
| Aggregate |
(Dollars in Millions) | Fair Value | Aggregate
Benefit Obligations in Excess of Plan Assets | of Plan Assets | Benefit Obligation
Projected Benefit Obligation | $ | 2,337 |  | $ | (2,677 | )
Accumulated Benefit Obligation | 2,337 |  | (2,542 | )
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) | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Service Cost Included in Labor and Fringe | $ | 32 |  |  | $ | 36 |  |  | $ | 48 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |
Interest Cost | 92 |  |  | 92 |  |  | 119 |  |  | 7 |  |  | 7 |  |  | 12 |
Expected Return on Plan Assets | (176 | ) |  | (171 | ) |  | (157 | ) |  | — |  |  | — |  |  | — |
Amortization of Net Loss | 41 |  |  | 41 |  |  | 48 |  |  | — |  |  | — |  |  | 3 |
Amortization of Prior Service Cost | — |  |  | — |  |  | — |  |  | (2 | ) |  | — |  |  | — |
Total Income Included in Other Income - Net | (43 | ) |  | (38 | ) |  | 10 |  |  | 5 |  |  | 7 |  |  | 15 |
Net Periodic Benefit Cost | $ | (11 | ) |  | $ | (2 | ) |  | $ | 58 |  |  | $ | 7 |  |  | $ | 9 |  |  | $ | 17 |
Restructuring Charge - Non Operating(a) | — |  |  | 60 |  |  | — |  |  | — |  |  | 13 |  |  | — |
Settlement (Gain) Loss | (1 | ) |  | 11 |  |  | (1 | ) |  | — |  |  | — |  |  | — |
Total (Credit) Expense | $ | (12 | ) |  | $ | 69 |  |  | $ | 57 |  |  | $ | 7 |  |  | $ | 22 |  |  | $ | 17 |
(a) Charges related to special termination benefits and curtailment costs were the result of the management workforce reductions in first quarter 2017. See Restructuring Charge in Note 1, Nature of Operations and Significant Accounting Policies.
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 Benefits |  | Post-retirement Benefits
Components of Other Comprehensive | December |  | December |  | December |  | December
Loss (Income) | 2018 |  | 2017 |  | 2018 |  | 2017
Recognized in the Balance Sheet |  |  |  |  |  |  |
Losses (Gains) | $ | 223 |  |  | $ | (131 | ) |  | $ | (112 | ) |  | $ | (17 | )
Expense (Income) Recognized in the Income Statement |  |  |  |  |  |  |  |  |  |  |
Amortization of Net Losses (a) | $ | 41 |  |  | $ | 41 |  |  | $ | — |  |  | $ | — |
Settlement (Gain) Loss | (1 | ) |  | 11 |  |  | — |  |  | — |
Curtailment Loss | — |  |  | 4 |  |  | — |  |  | — |
Amortization of Prior Service Costs | — |  |  | — |  |  | (2 | ) |  | — |
(a) | Amortization of net losses estimated to be expensed for 2019 is approximately $43 million for pension benefits.
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 Benefits |  | Post-retirement Benefits |
| 2018 |  | 2017 |  | 2018 |  | 2017 |
Expected Long-term Return on Plan Assets: |  |  |  |  |  |  |  |
Benefit Cost for Current Plan Year | 6.75 | % |  | 6.75 | % |  | N/A |  |  | N/A |  |
Benefit Cost for Subsequent Plan Year | 6.75 | % |  | 6.75 | % |  | N/A |  |  | N/A |  |
Discount Rates: |  |  |  |  |  |  |  |
Benefit Cost for Plan Year |  |  |  |  |  |  |  |
Service Cost for Plan Year | 3.74 | % |  | 4.26 | % | (a) | 4.14 | % | (c) | 4.11 | % | (b)
Interest Cost for Plan Year | 3.15 | % |  | 3.26 | % | (a) | 3.45 | % | (c) | 2.78 | % | (b)
Benefit Obligation at End of Plan Year | 4.24 | % |  | 3.56 | % |  | 3.98 | % |  | 3.34 | % |
Salary Scale Inflation | 4.60 | % |  | 4.60 | % |  | N/A |  |  | N/A |  |
(a) | The pension benefits service cost and interest cost for 2017 were based on a weighted average discount rate of 4.35% and 3.37%, respectively, prior to the management workforce reduction program initiated in 2017 and were reduced to 4.26% and 3.26%, respectively, after the Company remeasured the pension benefits obligation and pension plan assets in the second quarter of 2017.
(b) | The post-retirement benefits service cost and interest cost for 2017 were based on a weighted average discount rate of 4.20% and 2.88%, respectively, prior to the management workforce reduction program initiated in 2017 and were reduced to 4.11% and 2.78%, respectively, after the Company remeasured the other post-retirement benefits obligation in the first quarter of 2017.
(c) | The post-retirement benefits service cost and interest cost for 2018 were based on a weighted average discount rate of 3.68% and 2.79%, respectively, prior to the post-retirement plan amendments approved in 2018 and were increased to 4.14% and 3.45%, respectively, after the Company remeasured the other post-retirement benefits obligation in the fourth quarter of 2018.

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- Definition This element may be used to capture the net increase or decrease in the plan benefit obligation during the reporting period by detailing the changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, as well as the actuarial present value of the benefit obligation. + References No definition available. + Details
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- Definition Schedule of Benefit Plans Participants [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the aggregate benefit obligation and aggregate fair value of plan assets for pension plans and/or other employee benefit plans with benefit obligations in excess of plan assets as of the measurement date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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