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Casualty, Environmental and Other Reserves (Tables) | 12 Months Ended
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Dec. 31, 2018
Casualty, Environmental and Other Reserves [Abstract] |
Schedule of Claims Activity | Activity related to casualty, environmental and other reserves is as follows:
| Casualty |  | Environmental |  | Other |  |
(Dollars in Millions) | Reserves |  | Reserves |  | Reserves |  | Total
December 25, 2015 | $ | 269 |  |  | $ | 82 |  |  | $ | 49 |  |  | $ | 400 |
Charged to Expense | 52 |  |  | 46 |  |  | 30 |  |  | 128 |
Change in Estimate(a) | (28 | ) |  | — |  |  | — |  |  | (28 | )
Payments | (64 | ) |  | (33 | ) |  | (29 | ) |  | (126 | )
December 30, 2016 | 229 |  |  | 95 |  |  | 50 |  |  | 374 |
Charged to Expense | 43 |  |  | 26 |  |  | 45 |  |  | 114 |
Payments | (44 | ) |  | (31 | ) |  | (39 | ) |  | (114 | )
December 31, 2017 | 228 |  |  | 90 |  |  | 56 |  |  | 374 |
Charged to Expense | 47 |  |  | 10 |  |  | 41 |  |  | 98 |
Change in Estimate(a) | (26 | ) |  | — |  |  | — |  |  | (26 | )
Payments | (50 | ) |  | (20 | ) |  | (52 | ) |  | (122 | )
December 31, 2018 | $ | 199 |  |  | $ | 80 |  |  | $ | 45 |  |  | $ | 324 |
(a) | Changes in estimates are the result of continued safety improvements and a continuing decline in the severity of injuries.
Schedule of Balance Sheet Presentation of Casualty, Environmental and Other Reserves | Casualty, environmental and other reserves are provided for in the consolidated balance sheets as shown in the table below.
| December 2018 |  | December 2017
(Dollars in Millions) | Current |  | Long-term |  | Total |  | Current |  | Long-term |  | Total
Casualty: |  |  |  |  |  |  |  |  |  |  |
Personal Injury | $ | 40 |  |  | $ | 103 |  |  | $ | 143 |  |  | $ | 43 |  |  | $ | 125 |  |  | $ | 168 |
Occupational | 10 |  |  | 46 |  |  | 56 |  |  | 6 |  |  | 54 |  |  | 60 |
Total Casualty | $ | 50 |  |  | $ | 149 |  |  | $ | 199 |  |  | $ | 49 |  |  | $ | 179 |  |  | $ | 228 |
Environmental | 39 |  |  | 41 |  |  | 80 |  |  | 31 |  |  | 59 |  |  | 90 |
Other | 24 |  |  | 21 |  |  | 45 |  |  | 28 |  |  | 28 |  |  | 56 |
Total | $ | 113 |  |  | $ | 211 |  |  | $ | 324 |  |  | $ | 108 |  |  | $ | 266 |  |  | $ | 374 |

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