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Contingencies (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 17, 2015 Plaintiff Entity People Insurance_company | Apr. 30, 2013 People | Mar. 31, 2016 processingFacility mine | Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, number of processing facilities | processingFacility |  |  | 3 |
Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of people killed |  | 15 |  |
Number of people injured |  | 200 |  |
Number of plaintiffs | Plaintiff | 400 |  |  |
Number of entities that filed claims | Entity | 9 |  |  |
Number of people that filed claims | 325 |  |  |
Number of insurance companies that filed claims | Insurance_company | 80 |  |  |
Loss Contingency, Estimate of Possible Loss | $ |  |  |  | $ 37
IDAHO |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, number of mines | mine |  |  | 18 |

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
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