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Pension and Other Postretirement Benefit Plans - Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Costs, Future Period 6.00%    
Assumptions Used to Determine Benefit Obligation [Abstract]      
Discount Rate 3.05% 2.62%  
Rate of Compensation Increase 3.58% 3.61%  
Assumptions Used to Determine Net Periodic Benefit Costs [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 2.87% 3.52% 4.67%
Expected Long-Term Return on Plan Assets [1] 6.50% 6.75% 7.25%
Rate of Compensation Increase 3.62% 4.06% 4.04%
Postretirement Health and Life [Member]      
Assumptions Used to Determine Benefit Obligation [Abstract]      
Discount Rate 3.09% 2.70%  
Health Care Trend Rates [Abstract]      
Trend Rate 5.66% 5.81%  
Ultimate Trend Rate 4.50% 4.50%  
Year Ultimate Trend Rate Effective 2038 2038  
Assumptions Used to Determine Net Periodic Benefit Costs [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 2.70% 3.45% 4.47%
Expected Long-Term Return on Plan Assets [1] 5.85% 6.08% 6.51%
Postretirement Health and Life [Member] | Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Costs, Future Period 4.80%    
Postretirement Health and Life [Member] | Maximum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Costs, Future Period 6.00%    
[1] The expected long-term rates of return used to determine net periodic benefit expense for 2022 have been reduced to 6.00 percent for pension expense and 4.80 percent to 6.00 percent for postretirement health and life expense.