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Retirement Benefits (Funded Status Of Benefit Plans And Amounts Included In Regulatory Assets And OCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in plan assets:      
Funded status – surplus $ (954) $ (734)  
Accrued benefit asset at December 31 (954) (734)  
Amounts recognized in the balance sheet consist of:      
Noncurrent asset (977) (757)  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year 3,773 3,962  
Change in benefit obligation:      
Net benefit obligation at beginning of year 4,134 4,258  
Service cost 82 88 $ 79
Interest cost 234 222 221
Participant contributions 0 0  
Actuarial (gain) loss 28 (143)  
Benefits paid (299) (291)  
Net benefit obligation at end of year 3,939 4,134 4,258
Change in plan assets:      
Fair value of plan assets at beginning of year 4,182 4,272  
Actual return on plan assets 456 193  
Employer contributions 3 8 4
Participant contributions 0 0  
Benefits paid (299) (291)  
Fair value of plan assets at end of year 4,102 4,182 4,272
Funded status – surplus (163) (48)  
Accrued benefit asset at December 31 (163) (48)  
Amounts recognized in the balance sheet consist of:      
Noncurrent asset (186) (71)  
Liability, Defined Benefit Plan, Current 2 2  
Liability, Defined Benefit Plan, Noncurrent 21 21  
Amounts recognized in regulatory assets or liabilities consist of:      
Net actuarial (gain) loss (45) 42  
Prior service credit 0 0  
Amounts recognized in accumulated OCI (pretax) consist of:      
Net actuarial (gain) loss 22 26  
Total (23) 68  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan (240) 0  
Plan amendments (240) 0  
Defined Benefit Plan Plan Assets Pre Tax Gain 15    
Postretirement Benefits      
Change in benefit obligation:      
Net benefit obligation at beginning of year 807 856  
Service cost 10 12 12
Interest cost 45 44 45
Participant contributions 7 7  
Actuarial (gain) loss 5 (51)  
Benefits paid (68) (61)  
Net benefit obligation at end of year 806 807 856
Change in plan assets:      
Fair value of plan assets at beginning of year 1,493 1,393  
Actual return on plan assets 162 150  
Employer contributions 3 4 3
Participant contributions 7 7  
Benefits paid (68) (61)  
Fair value of plan assets at end of year 1,597 1,493 $ 1,393
Funded status – surplus (791) (686)  
Accrued benefit asset at December 31 (791) (686)  
Amounts recognized in the balance sheet consist of:      
Noncurrent asset (791) (686)  
Liability, Defined Benefit Plan, Current 0 0  
Liability, Defined Benefit Plan, Noncurrent 0 0  
Amounts recognized in regulatory assets or liabilities consist of:      
Net actuarial (gain) loss (404) (379)  
Prior service credit (18) (21)  
Amounts recognized in accumulated OCI (pretax) consist of:      
Net actuarial (gain) loss (7) (7)  
Total (429) (407)  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan 0 0  
Plan amendments $ 0 $ 0