v3.26.1
Pension And Postretirement Benefits (Qualified Pension and Postretirement Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Net (credit) cost $ (396) $ (397)
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost – benefits earned during the period 101 107
Interest Cost on projected/accumulated benefit obligations 361 400
Expected return on assets 525 507
Amortization of prior service credit (11) (12)
Net (credit) cost (74) (12)
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost – benefits earned during the period 4 4
Interest Cost on projected/accumulated benefit obligations 73 80
Expected return on assets 6 10
Amortization of prior service credit (393) (459)
Net (credit) cost $ (322) $ (385)