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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 112 | $ 113
Long-term | 207 | 211
Total | 319 | 324
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 51 | 50
Long-term | 144 | 149
Total | 195 | 199
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 41 | 40
Long-term | 100 | 103
Total | 141 | 143
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 10 | 10
Long-term | 44 | 46
Total | 54 | 56
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 38 | 39
Long-term | 42 | 41
Total | 80 | 80
Other |  |
Loss Contingencies [Line Items] |  |
Current | 23 | 24
Long-term | 21 | 21
Total | $ 44 | $ 45

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