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Employee Benefit Plans (Asset Strategy Allocation) (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 100.00% |
Percentage of plan assets by strategy | 100.00% | 100.00%
Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 23.00% | 27.00%
International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 18.00% | 17.00%
Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 10.00% | 10.00%
Total Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 51.00% | 54.00%
Actual percentage of the fair value of total Plan assets held | 61.00% |
Domestic Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 25.00% | 23.00%
High Yield Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 8.00% | 8.00%
Total Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 33.00% | 31.00%
Actual percentage of the fair value of total Plan assets held | 21.00% |
Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 5.00% | 5.00%
Actual percentage of the fair value of total Plan assets held | 5.00% |
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of plan assets by strategy | 11.00% | 10.00%
Actual percentage of the fair value of total Plan assets held | 13.00% |
Minimum | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 15.00% |
Minimum | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 10.00% |
Minimum | Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 0.00% |
Minimum | Total Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 30.00% |
Minimum | Domestic Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 10.00% |
Minimum | High Yield Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 0.00% |
Minimum | Total Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 10.00% |
Minimum | Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 0.00% |
Minimum | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 0.00% |
Maximum | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 40.00% |
Maximum | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 25.00% |
Maximum | Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 15.00% |
Maximum | Total Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 70.00% |
Maximum | Domestic Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 40.00% |
Maximum | High Yield Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 25.00% |
Maximum | Total Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 65.00% |
Maximum | Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 10.00% |
Maximum | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range | 20.00% |

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- Definition Defined Benefit Plan, Fair Value of Plan Assets, Actual Allocation, Percentage + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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