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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies. |
Changes to Gross Insurance Liabilities | The changes to our insurance reserves for the years ended December 31 are summarized below (in millions):
|  | 2017(a) |  | 2016
Balance as of January 1 |  | $ | 588 |  | $ | 643
Self-insurance expense |  |  | 142 |  |  | 71
Cash paid |  |  | (148) |  |  | (126)
Balance as of December 31 |  | $ | 582 |  | $ | 588
Current portion as of December 31 |  | $ | 107 |  | $ | 133
Long-term portion as of December 31 |  | $ | 475 |  | $ | 455
| (a) |  | Based on current estimates, we anticipate that most of our insurance reserves will be settled in cash over the next six years.

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- Definition Tabular disclosure of the gross changes to the insurance liability. + References No definition available. + Details
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