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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2022
Commitments and Contingencies. |
Changes to Gross Insurance Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022(a) |  | 2021
Balance as of January 1 | ​ | $ | 734 | ​ | $ | 664
Self-insurance expense | ​ |  | 242 | ​ |  | 240
Cash paid and other | ​ | ​ | (247) | ​ | ​ | (170)
Balance as of December 31 | ​ | $ | 729 | ​ | $ | 734
Current portion as of December 31 | ​ | $ | 189 | ​ | $ | 191
Long-term portion as of December 31 | ​ | $ | 540 | ​ | $ | 543
(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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