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Retirement Benefits - Combined Targeted and Actual Domestic and Foreign Pension Plans Weighted Average Asset Allocation (Details)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, actual   100.00% 100.00%
Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, target 100.00%    
Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, actual   23.00% 22.00%
Equity securities | Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, target 32.00%    
Debt securities & Cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, actual   77.00% 77.00%
Debt securities & Cash | Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, target 68.00%    
Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, actual   0.00% 1.00%
Alternative Investments | Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of plan assets, target 0.00%