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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 104 | $ 100
Long-term | 205 | 205
Total | 309 | 305
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 53 | 48
Long-term | 139 | 139
Total | 192 | 187
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 44 | 42
Long-term | 85 | 87
Total | 129 | 129
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 9 | 6
Long-term | 54 | 52
Total | 63 | 58
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 30 | 31
Long-term | 44 | 43
Total | 74 | 74
Other |  |
Loss Contingencies [Line Items] |  |
Current | 21 | 21
Long-term | 22 | 23
Total | $ 43 | $ 44

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