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Employee Benefit Plans - Health Care Cost Trend Rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan Health Care Cost Trend Rate Assumed for Pre Retirement | 7.00% | 6.50% | 6.75%
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 | 2028 | 2028

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