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Employee Benefit Plans (Other Pension Assumptions) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of compensation increase (average) | 4.25% | 4.25%
Assumed health care cost trend rate Initial trend | 6.00% | 6.25%
Assumed health care cost trend rate Ultimate trend | 5.00% | 5.00%
Assumed health care cost trend rate Year ultimate trend reached | 2025 | 2025
Pension Plans | Qualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 2.55% | 3.30%
Interest crediting rate (average) | 3.70% | 3.85%
Pension Plans | Nonqualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 2.10% | 3.05%
Interest crediting rate (average) | 4.00% | 4.15%
Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 2.40% | 3.20%
Interest crediting rate (average) | 1.30% | 2.05%

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- Definition Represents the assumed health care cost trend rate - Initial trend + References No definition available. + Details
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- Definition Represents assumed health care cost trend rate - Ultimate trend + References No definition available. + Details
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- Definition Reprsents assumed health care cost trend rate - Year ultimate trend reached + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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