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Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Activity related to self-insured property and casualty reserves | The following table summarizes the 2017 and 2016 activity related to our net self-insured property and casualty reserves as of December 31, 2017.
|  | Beginning Balance |  | Expense |  | Payments |  | Ending Balance
2017 Activity |  | $ | 98 |  |  | 27 |  |  | (41 | ) |  | $ | 84 |
2016 Activity |  | $ | 102 |  |  | 42 |  |  | (46 | ) |  | $ | 98 |

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