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Retirement Benefits (Components Of Net Periodic Benefit Cost) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Total non-service cost components $ (59) $ (76) $ (187) $ (228)
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost 21 22 62 66
Interest cost 58 56 175 167
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (76) (82) (227) (246)
Prior service cost (credit) 0 0 0 0
Actuarial (gain) (9) (17) (26) (50)
Total non-service cost components (27) (43) (78) (129)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (6) (21) $ (16) (63)
Defined Benefit Plan, Amortization Period of Actuarial Gain (Loss)     10 years  
Defined Benefit Plan, Difference Between Actual and Expected Return (Loss) on Plan Assets Amortization Period     4 years  
Other Postretirement Benefit Plan, Defined Benefit        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost 3 3 $ 8 9
Interest cost 11 11 33 33
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (24) (23) (71) (69)
Prior service cost (credit) (1) (1) (3) (3)
Actuarial (gain) (9) (9) (27) (29)
Total non-service cost components (23) (22) (68) (68)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ (20) $ (19) $ (60) $ (59)
Defined Benefit Plan, Amortization Period of Actuarial Gain (Loss)     10 years  
Defined Benefit Plan, Difference Between Actual and Expected Return (Loss) on Plan Assets Amortization Period     4 years