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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 106 | $ 108
Long-term | 258 | 266
Total | 364 | 374
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 49 | 49
Long-term | 173 | 179
Total | 222 | 228
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 42 | 43
Long-term | 120 | 125
Total | 162 | 168
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 6
Long-term | 53 | 54
Total | 60 | 60
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 31 | 31
Long-term | 58 | 59
Total | 89 | 90
Other |  |
Loss Contingencies [Line Items] |  |
Current | 26 | 28
Long-term | 27 | 28
Total | $ 53 | $ 56

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