Retirement Benefits (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Non-service Cost or Income Components	$ 304	$ 295	$ 184
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	88	79	128
Interest cost	222	221	163
Expected return on plan assets(b)	(327)	(333)	(320)
Prior service cost (credit)	0	0	0
Actuarial (gain) loss	(67)	(115)	25
Defined Benefit Plan, Non-service Cost or Income Components	(172)	(227)	(132)
Net periodic benefit cost (income)(d)	$ (84)	(148)	(4)
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	$ 12	12	20
Interest cost	44	45	34
Expected return on plan assets(b)	(93)	(91)	(85)
Prior service cost (credit)	(4)	(4)	(4)
Actuarial (gain) loss	(38)	(45)	(19)
Defined Benefit Plan, Non-service Cost or Income Components	(91)	(95)	(74)
Net periodic benefit cost (income)(d)	$ (79)	$ (83)	$ (54)
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