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Retirement Benefits (Benefit Assumptions) (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Health care cost trend rate 7.48% 7.14%
Rate to which the cost trend is assumed to decline (the ultimate trend rate) 5.18% 4.95%
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 5.00% 2.79%
Discount rate 2.70% 2.57%
Tax exempt accounts 7.00% 4.76%
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.46% 2.24%
Discount rate 2.58% 2.18%
Tax exempt accounts 7.00% 7.00%
Taxable accounts 4.75% 4.75%