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Employee Benefit Plans (Narrative) (Details) - Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Deferred Compensation Arrangement with Individual, Requisite Age |  | 50 years
Deferred Compensation Arrangement with Individual, Requisite Service Period | 10 years |
Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Deferred Compensation Arrangement with Individual, Requisite Age |  | 55 years
Deferred Compensation Arrangement with Individual, Requisite Service Period | 20 years |

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- Definition Deferred Compensation Arrangement with Individual, Requisite Age + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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