Debt Financed Shares Held By Employee Stock Ownership Plans.

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Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate Of Return On Plan Assets, Period Increase (Decrease), Percent

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Percentage increase (decrease) in the actual long-term rate of return.

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The estimated annual health care cost trend rate (current and prior year).

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Defined Benefit Plan, Investment Within Plan Asset Category, Decrease For Sale

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Increase (Decrease) in the discount rate used to calculate benefit obligations paid out to participants.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of investment within defined benefit plan asset category.

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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Pension And Postretirement Benefits (Narrative) (Details) - USD ($)	1 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost				$ 711,000,000	$ 2,762,000,000	$ (4,251,000,000)
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ (2,992,000,000)	$ (2,002,000,000)	(1,148,000,000)
Composite rate of compensation increase for determining benefit obligation	3.00%	3.00%		3.00%	3.00%
Discretionary contributions to postretirement plan	$ 425,000,000	$ 200,000,000
Debt-financed shares held by ESOPs (allocated or unallocated)	0			$ 0
Benefit cost of the contributory savings plans				814,000,000	$ 793,000,000	724,000,000
Forecast
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in plan benefit obligations due to change in assumed rates			$ 277,000,000
Assumptions used, percentage change in weighted-average interest crediting rate that would impact pension benefit obligation			(0.50%)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Special termination benefits				0	81,000,000
Accumulated benefit obligation for pension plans	$ 60,848,000,000	$ 58,150,000,000		60,848,000,000	58,150,000,000
Combined net pension and postretirement cost				$ 1,450,000,000	$ 2,393,000,000	$ (909,000,000)
Discount rate for determining projected benefit obligation	2.70%	3.40%		2.70%	3.40%	4.50%
Decrease in discount rate over prior year				0.70%	1.10%
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ 5,594,000,000	$ 8,018,000,000
Long-term rate of return on plan assets				7.00%	7.00%	7.00%
Composite rate of compensation increase for determining benefit obligation	3.00%	3.00%		3.00%	3.00%	3.00%
Preferred equity interest value	$ 54,606,000,000	$ 53,530,000,000		$ 54,606,000,000	$ 53,530,000,000	$ 51,681,000,000
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date	11.00%			11.00%
Pension Benefits \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value	$ 8,390,000,000	11,639,000,000		$ 8,390,000,000	11,639,000,000	11,333,000,000
Pension Benefits \| Preferred interest
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value	5,771,000,000	8,806,000,000		5,771,000,000	8,806,000,000
Pension Benefits \| Preferred interest \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value	$ 5,771,000,000	8,806,000,000		5,771,000,000	8,806,000,000
Pension Benefits \| Mobility II, LLC \| Preferred interest
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value held by pension trust		$ 8,806,000,000			8,806,000,000
Value of portion of preferred interest sold to third party investors				2,885,000,000
Pension Benefits \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on plan assets			6.75%
Downward adjustment to expected long-term rate of return on plan assets			0.25%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Special termination benefits				0	0
Combined net pension and postretirement cost				$ (739,000,000)	$ 369,000,000	$ (3,342,000,000)
Discount rate for determining projected benefit obligation	2.40%	3.20%		2.40%	3.20%	4.40%
Decrease in discount rate over prior year				0.80%	1.20%
Increase (decrease) in plan benefit obligations due to change in assumed rates				$ 1,311,000,000	$ 2,399,000,000
Long-term rate of return on plan assets				4.75%	5.75%	5.75%
Composite rate of compensation increase for determining benefit obligation	3.00%	3.00%		3.00%	3.00%	3.00%
Preferred equity interest value	$ 3,843,000,000	$ 4,145,000,000		$ 3,843,000,000	$ 4,145,000,000	$ 4,277,000,000
Aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date	1.00%			1.00%
Postretirement Benefits \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Preferred equity interest value	$ 4,000,000	$ 32,000,000		$ 4,000,000	32,000,000	13,000,000
Postretirement Benefits \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on plan assets			4.50%
Downward adjustment to expected long-term rate of return on plan assets			0.25%
Healthcare Benefits \| Prescription Drug Cost - Eligible Participants
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in plan benefit obligations due to change in assumed rates					$ (102,000,000)
Assumed annual and ultimate health care cost trend rate for next fiscal year	4.00%			4.00%
Estimated annual growth rate for health care cost	4.00%	4.50%		4.00%	4.50%
Healthcare Benefits \| Medical Cost - Eligible Participants
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in plan benefit obligations due to change in assumed rates					$ (102,000,000)
Assumed annual and ultimate health care cost trend rate for next fiscal year	4.00%			4.00%
Estimated annual growth rate for health care cost	4.00%	4.50%		4.00%	4.50%
Healthcare Benefits \| Administrative Expense
Defined Benefit Plan Disclosure [Line Items]
Percent of growth assumed				2.50%
Healthcare Benefits \| Administrative Expense \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Percent of growth assumed			2.50%
Healthcare Benefits \| Dental Claims
Defined Benefit Plan Disclosure [Line Items]
Percent of growth assumed				3.00%
Healthcare Benefits \| Dental Claims \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Percent of growth assumed			3.00%
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost				$ 330,000,000	$ 438,000,000
Discount rate for determining projected benefit obligation	2.30%	3.20%		2.30%	3.20%
Projected benefit obligation	$ 2,687,000,000	$ 2,605,000,000		$ 2,687,000,000	$ 2,605,000,000
Deferred compensation expense				$ 183,000,000	$ 199,000,000	$ 128,000,000