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Commitments and Contingencies Guarantees and Bond Indemnifications (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies, Guarantees and Indemnifications [Abstract] |  |
Assets Held As Collateral For Guarantor Obligations | $ 0 | $ 0
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 60,000,000 | $ 62,000,000

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of assets held either as collateral or by third parties that, upon the occurrence of any triggering event or condition under the guarantee, the guarantor can obtain and liquidate to recover all or a portion of the amounts paid under the guarantee. + References No definition available. + Details
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Period Type: | instant

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- Definition Commitments and Contingencies, Guarantees and Indemnifications [Abstract] + References No definition available. + Details
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