Pension And Other Postretirement Benefits (Benefit Obligations And Plan Assets Associated With Principal Benefit Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in benefit obligation
Medicare subsidy receipts	$ 19	$ 24
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (percent)	5.30%	5.60%
Long-term rate of compensation increase (percent)	4.50%	4.50%
Change in benefit obligation
Benefit obligation at January 1	$ 5,211	$ 7,265
Service cost	78	138	$ 188
Interest cost	276	216	221
Actuarial loss/(gain)	176	(1,990)
Benefits paid	(545)	(492)
Foreign exchange rate changes	11	(47)
Amendments, divestments and other	(193)	121
Benefit obligation at December 31	$ 5,014	$ 5,211	7,265
United States | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (percent)	5.30%	5.60%
Long-term rate of compensation increase (percent)	4.50%	4.50%
Change in benefit obligation
Benefit obligation at January 1	$ 12,350	$ 18,511
Service cost	466	712	919
Interest cost	664	518	558
Actuarial loss/(gain)	550	(4,432)
Benefits paid	(870)	(2,959)
Amendments, divestments and other	(17)	0
Benefit obligation at December 31	13,143	12,350	18,511
Accumulated benefit obligation at December 31	$ 11,033	$ 10,367
Pension Benefits - Non-U.S. [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (percent)	4.30%	4.90%
Long-term rate of compensation increase (percent)	4.50%	5.20%
Change in benefit obligation
Benefit obligation at January 1	$ 19,342	$ 29,492
Service cost	323	570	774
Interest cost	922	614	526
Actuarial loss/(gain)	1,393	(7,742)
Benefits paid	(1,214)	(1,415)
Foreign exchange rate changes	515	(2,258)
Amendments, divestments and other	46	81
Benefit obligation at December 31	21,327	19,342	$ 29,492
Accumulated benefit obligation at December 31	$ 19,769	$ 18,047