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Pension and Postretirement Benefits (Weighted Average Assumptions - Projected Benefit Obligation And Net Pension And Postemployment Benefit Cost) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Composite rate of compensation increase for determining benefit obligation 3.00% 3.00%  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average discount rate for determining benefit obligation at December 31 5.70% 5.00% 5.20%
Weighted-average interest credit rate for cash balance pension programs 4.60% 4.20% 4.10%
Long-term rate of return on plan assets 7.75% 7.50% 6.75%
Composite rate of compensation increase for determining benefit obligation 3.00% 3.00% 3.00%
Composite rate of compensation increase for determining net cost (credit) 3.00% 3.00% 3.00%
Assumptions used, percentage change in weighted-average interest crediting rate that would impact pension benefit obligation 0.50%    
Effect of 0.50% increase in weighted-average interest crediting rate, increase to pension benefit obligation $ 150    
Pension Benefits | Service Cost      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate in effect for determining net cost 5.10% 5.40% 4.40%
Pension Benefits | Interest Cost      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate in effect for determining net cost 4.90% 5.30% 3.90%
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average discount rate for determining benefit obligation at December 31 5.60% 5.00% 5.20%
Weighted-average interest credit rate for cash balance pension programs 0.00% 0.00% 0.00%
Long-term rate of return on plan assets 4.00% 6.50% 4.50%
Composite rate of compensation increase for determining benefit obligation 3.00% 3.00% 3.00%
Composite rate of compensation increase for determining net cost (credit) 3.00% 3.00% 3.00%
Postretirement Benefits | Service Cost      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate in effect for determining net cost 5.10% 5.20% 4.00%
Postretirement Benefits | Interest Cost      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate in effect for determining net cost 4.90% 5.10% 3.20%