v3.25.2
Pension And Postretirement Benefits (Qualified Pension and Postretirement Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net (credit) cost $ (397) $ (470) $ (794) $ (941)
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – benefits earned during the period 107 121 214 243
Interest Cost on projected/accumulated benefit obligations 401 397 801 793
Expected return on assets 509 552 1,016 1,105
Amortization of prior service credit (12) (22) (24) (44)
Net (credit) cost (13) (56) (25) (113)
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – benefits earned during the period 5 6 9 11
Interest Cost on projected/accumulated benefit obligations 79 78 159 155
Expected return on assets 8 16 18 30
Amortization of prior service credit (460) (482) (919) (964)
Net (credit) cost $ (384) $ (414) $ (769) $ (828)