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Employee Postretirement Benefits - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount Rate 2.78% 3.47% 4.50%
Long-Term Rate of Return on Plan Assets 6.51% 6.88% 7.25%
Pension Plan | Participants to Age 39      
Defined Benefit Plan Disclosure [Line Items]      
Rate of Increase in Future Compensation 4.50% 4.50% 4.50%
Pension Plan | Participants Ages 40 to 49      
Defined Benefit Plan Disclosure [Line Items]      
Rate of Increase in Future Compensation 3.50% 3.50% 3.50%
Pension Plan | Participants Age 50 and Older      
Defined Benefit Plan Disclosure [Line Items]      
Rate of Increase in Future Compensation 2.75% 2.75% 2.75%
Executive Survivor and Supplemental Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount Rate 2.61% 3.36% 4.46%
Rate of Increase in Future Compensation 3.00% 3.50% 3.40%
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount Rate 2.75% 3.43% 4.44%