Pension And Postretirement Benefits (Net Periodic Benefit Cost (Credit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement cost (credit)	$ (1,817)	$ (1,017)	$ (4,789)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	487	477	617
Interest cost on projected benefit obligation	1,586	1,876	1,747
Expected return on assets	(2,212)	(2,533)	(3,107)
Amortization of prior service credit	(87)	(133)	(133)
Net periodic benefit cost (credit) before remeasurement	(226)	(313)	(876)
Actuarial (gain) loss	38	1,717	(115)
Settlement (gain) loss	0	(363)	0
Net pension and postretirement cost (credit)	(188)	1,041	(991)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	22	23	32
Interest cost on projected benefit obligation	310	340	277
Expected return on assets	(61)	(130)	(112)
Amortization of prior service credit	(1,928)	(2,472)	(2,558)
Net periodic benefit cost (credit) before remeasurement	(1,657)	(2,239)	(2,361)
Actuarial (gain) loss	28	181	(1,437)
Settlement (gain) loss	0	0	0
Net pension and postretirement cost (credit)	$ (1,629)	$ (2,058)	$ (3,798)