Postretirement Plans (Schedule Of Changes In The Benefit Obligation, Plan Assets And Funded Status Of Both Pensions And OPB) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued pension plan liability, net	$ (9,104)	$ (14,408)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	82,415	77,645
Service cost	3	3	$ 2
Interest cost	1,988	2,455	2,925
Actuarial (gain)/loss	(3,249)	7,759
Settlement/other	870	68
Gross benefits paid	(4,653)	(5,386)
Exchange rate adjustment	1	7
Ending balance	75,635	82,415	77,645
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	68,696	61,711
Actual return on plan assets	4,477	9,275
Company contribution	11	3,013
Settlement payments	(870)	(68)
Benefits paid	(4,502)	(5,241)
Exchange rate adjustment	1	6
Ending balance at fair value	67,813	68,696	61,711
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets	1,426	837
Accrued liabilities	(144)	(148)
Accrued pension plan liability, net	(9,104)	(14,408)
Net amount recognized	(7,822)	(13,719)
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	4,693	5,080
Service cost	87	89	77
Interest cost	97	130	196
Amendments		(29)
Actuarial (gain)/loss	(401)	(218)
Settlement/other		55
Gross benefits paid	(411)	(450)
Subsidies	26	36
Exchange rate adjustment	1
Ending balance	4,092	4,693	5,080
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value	160	149
Actual return on plan assets	21	21
Plan participants' contributions	6	6
Benefits paid	(15)	(16)
Ending balance at fair value	172	160	$ 149
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued liabilities	(392)	(396)
Accrued retiree health care	(3,528)	(4,137)
Net amount recognized	$ (3,920)	$ (4,533)