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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 110 | $ 113
Long-term | 195 | 211
Total | 305 | 324
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 56 | 50
Long-term | 128 | 149
Total | 184 | 199
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 47 | 40
Long-term | 78 | 103
Total | 125 | 143
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 9 | 10
Long-term | 50 | 46
Total | 59 | 56
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 32 | 39
Long-term | 46 | 41
Total | 78 | 80
Other |  |
Loss Contingencies [Line Items] |  |
Current | 22 | 24
Long-term | 21 | 21
Total | $ 43 | $ 45

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