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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
Commitments and Contingencies. |
Changes to Gross Insurance Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021(a) |  | 2020
Balance as of January 1 | ​ | $ | 664 | ​ | $ | 575
Self-insurance expense | ​ |  | 240 | ​ |  | 172
Cash paid and other | ​ | ​ | (170) | ​ | ​ | (151)
Other (b) | ​ | ​ | — | ​ | ​ | 68
Balance as of December 31 | ​ | $ | 734 | ​ | $ | 664
Current portion as of December 31 | ​ | $ | 191 | ​ | $ | 175
Long-term portion as of December 31 | ​ | $ | 543 | ​ | $ | 489
(a) | Based on current estimates, we anticipate that most of our insurance reserves will be settled in cash over the next six years.
(b) | Insurance reserves of $68 million as of December 31, 2020 related to the acquisition of Advanced Disposal.

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