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Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Health care cost trend rate 4.00%    
Year that rate reaches ultimate trend rate 2026    
Costs for defined contribution plans $ 415 $ 383 $ 365
Equity Securities [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 40.00%    
Equity Securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 15.00%    
Venture Capital Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 10.00%