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Retirement Benefits (Components Of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Non-service Cost or Income Components $ 247 $ 304 $ 295
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 82 88 79
Interest cost 234 222 221
Expected return on plan assets(b) (303) (327) (333)
Prior service cost (credit) 0 0 0
Actuarial (gain) (34) (67) (115)
Defined Benefit Plan, Non-service Cost or Income Components (103) (172) (227)
Net periodic benefit cost (income)(d) $ (21) (84) (148)
Defined Benefit Plan, Amortization of Gain (Loss) 10 years    
Defined Benefit Plan, Difference Between Actual and Expected Return (Loss) on Plan Assets Amortization Period 4 years    
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 10 12 12
Interest cost 45 44 45
Expected return on plan assets(b) (94) (93) (91)
Prior service cost (credit) (4) (4) (4)
Actuarial (gain) (38) (38) (45)
Defined Benefit Plan, Non-service Cost or Income Components (91) (91) (95)
Net periodic benefit cost (income)(d) $ (81) $ (79) $ (83)
Defined Benefit Plan, Amortization of Gain (Loss) 10 years    
Defined Benefit Plan, Difference Between Actual and Expected Return (Loss) on Plan Assets Amortization Period 4 years