Pension And Postretirement Benefits (Narrative) (Details)		3 Months Ended	12 Months Ended
	Apr. 26, 2023 USD ($) numberOfParticipants	Jun. 30, 2024 USD ($)	Dec. 31, 2025 USD ($) Rate	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2032 Rate
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost				$ (1,817,000,000)	$ (1,017,000,000)	$ (4,789,000,000)
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ (1,883,000,000)	$ (2,552,000,000)	(3,237,000,000)
Composite rate of compensation increase for determining benefit obligation				3.00%	3.00%
Benefit cost of the contributory savings plans				$ 565,000,000	$ 570,000,000	611,000,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	$ 8,067,000,000
Defined Benefit Plan Number Of Participants | numberOfParticipants	96,000
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0		3,000,000	0
Settlement gain (loss)				0	363,000,000	0
Accumulated benefit obligation for pension plans				30,322,000,000	32,481,000,000
Combined net pension and postretirement cost				$ (188,000,000)	$ 1,041,000,000	$ (991,000,000)
Discount rate for determining projected benefit obligation				5.70%	5.00%	5.20%
Decrease in discount rate over prior year				0.70%	(0.20%)
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ (1,994,000,000)	$ 916,000,000
Long-term rate of return on plan assets				7.75%	7.50%	6.75%
Composite rate of compensation increase for determining benefit obligation				3.00%	3.00%	3.00%
Preferred equity interest value				$ 27,919,000,000	$ 30,098,000,000	$ 40,874,000,000
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date				100.00%	100.00%
Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value				$ 2,314,000,000	$ 2,957,000,000	9,773,000,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				0	0
Settlement gain (loss)				0	0	0
Combined net pension and postretirement cost				$ (1,629,000,000)	$ (2,058,000,000)	$ (3,798,000,000)
Discount rate for determining projected benefit obligation				5.60%	5.00%	5.20%
Decrease in discount rate over prior year				0.60%	(0.20%)
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ (317,000,000)	$ 110,000,000
Long-term rate of return on plan assets				4.00%	6.50%	4.50%
Composite rate of compensation increase for determining benefit obligation				3.00%	3.00%	3.00%
Preferred equity interest value				$ 1,144,000,000	$ 1,763,000,000	$ 2,160,000,000
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date				100.00%	100.00%
Postretirement Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value				$ 0	$ 1,000,000
Healthcare Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in plan benefit obligations due to change in assumed rates				144,000,000
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost				$ 18,000,000	$ 87,000,000
Discount rate for determining projected benefit obligation				5.50%	4.90%
Projected benefit obligation				$ 1,305,000,000	$ 1,437,000,000
Deferred compensation expense				$ 152,000,000	$ 101,000,000	$ 94,000,000
Forecast
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in plan benefit obligations due to change in assumed rates			$ 136,000,000
Assumptions used, percentage change in weighted-average interest crediting rate that would impact pension and postretirement benefit obligations			0.50%
Forecast | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on plan assets			7.75%
Forecast | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on plan assets			4.00%
Forecast | Prescription Drug Cost - Eligible Participants | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumed annual and ultimate health care cost trend rate for next fiscal year | Rate			4.50%
Forecast | Prescription Drug Cost - Eligible Participants | Healthcare Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumed annual and ultimate health care cost trend rate for next fiscal year			8.25%
Ultimate Health Care Cost Trend Rate | Rate							4.25%
Forecast | Medical Cost - Eligible Participants | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumed annual and ultimate health care cost trend rate for next fiscal year | Rate			4.50%
Forecast | Medical Cost - Eligible Participants | Healthcare Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumed annual and ultimate health care cost trend rate for next fiscal year			8.25%
Ultimate Health Care Cost Trend Rate | Rate							4.25%