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Other Comprehensive Income / (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Changes in the AOCI Balance by Component | Changes in the AOCI balance by component are shown in the following table. Amounts reclassified in pension and other post-employment benefits to net earnings relate to the amortization of actuarial losses and are included in other income-net on the consolidated income statements. See Note 8. Employee Benefit Plans for further information. Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified in other to net earnings are included in equity earnings of affiliates on the consolidated income statements.
| Pension and Other Post-Employment Benefits | Other | Accumulated Other Comprehensive Income (Loss)
(Dollars in millions) |  |  |
Balance December 25, 2015 - Net of Tax | $ | (601 | ) | $ | (64 | ) | $ | (665 | )
Other Comprehensive Income (Loss) |  |  |
(Loss) Income Before Reclassifications | (16 | ) | 3 |  | (13 | )
Amounts Reclassified to Net Earnings | 50 |  | 1 |  | 51 |
Tax Expense | (13 | ) | — |  | (13 | )
Total Other Comprehensive Income | 21 |  | 4 |  | 25 |
Balance December 30, 2016 - Net of Tax | (580 | ) | (60 | ) | (640 | )
Other Comprehensive Income (Loss) |  |  |
Income Before Reclassifications | 148 |  | 13 |  | 161 |
Amounts Reclassified to Net Earnings | 56 |  | 2 |  | 58 |
Tax Expense | (64 | ) | (1 | ) | (65 | )
Total Other Comprehensive Income | 140 |  | 14 |  | 154 |
Balance December 31, 2017 - Net of Tax | (440 | ) | (46 | ) | (486 | )
Other Comprehensive Income (Loss) |  |  |
Reclassification of Stranded Tax Effects (a) | (108 | ) | 1 |  | (107 | )
Loss Before Reclassifications | (111 | ) | (8 | ) | (119 | )
Amounts Reclassified to Net Earnings | 38 |  | (6 | ) | 32 |
Tax Benefit | 17 |  | 2 |  | 19 |
Total Other Comprehensive Loss | (164 | ) | (11 | ) | (175 | )
Balance December 31, 2018 - Net of Tax | $ | (604 | ) | $ | (57 | ) | $ | (661 | )
(a) As the result of a standard update adopted in 2018, certain tax effects stranded in accumulated other comprehensive income as a result of tax reform were reclassified to retained earnings. See further discussion in New Accounting Pronouncements in Note 1. Nature of Operations and Significant Accounting Policies.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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