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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 114 | $ 108
Long-term | 232 | 266
Total | 346 | 374
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 49 | 49
Long-term | 152 | 179
Total | 201 | 228
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 42 | 43
Long-term | 105 | 125
Total | 147 | 168
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 6
Long-term | 47 | 54
Total | 54 | 60
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 37 | 31
Long-term | 54 | 59
Total | 91 | 90
Other |  |
Loss Contingencies [Line Items] |  |
Current | 28 | 28
Long-term | 26 | 28
Total | $ 54 | $ 56

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