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Employee Benefit Plans - Health Care Cost Trend Rate (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan Health Care Cost Trend Rate Assumed for Pre Retirement | 7.00% | 7.00% | 6.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 4.50% | 4.50%
Year that the rate reaches the ultimate trend rate | 2033 | 2033 | 2028

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- Definition Defined benefit plan health care cost trend rate assumed for pre retirement. + References No definition available. + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Year ultimate health care cost trend rate is expected to be reached, in CCYY format. + 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 (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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