(Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Non-current liability	$ (1,055)	$ (1,578)
U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, January 1	11,699	10,467
Service cost	85	68	$ 153
Interest cost	393	440	467
Curtailment	0	0
Settlements	0	0
Actuarial (gain) loss	1,357	1,230
Acquisitions	0	0
Divestitures	0	0
Plan amendments	42	40
Benefits paid	(556)	(546)
Effect of foreign currency exchange rate movements	0	0
Benefit obligation, December 31	13,020	11,699	10,467
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	10,165	8,735
Actual return on plan assets	2,377	1,950
Company contributions	32	26
Benefits paid	(556)	(546)
Settlements	0	0
Effect of foreign currency exchange rate movements	0	0
Fair value of plan assets, December 31	12,018	10,165	8,735
Funded status, December 31	(1,002)	(1,534)
Non-current asset	0	0
Current liability	(20)	(28)
Non-current liability	(982)	(1,506)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(1,002)	(1,534)
Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, January 1	253	215
Service cost	5	5	5
Interest cost	6	8	8
Curtailment	(1)	(1)
Settlements	(5)	(6)
Actuarial (gain) loss	10	33
Acquisitions	0	3
Divestitures	(1)	(1)
Plan amendments	0	0
Benefits paid	(7)	(8)
Effect of foreign currency exchange rate movements	4	5
Benefit obligation, December 31	264	253	215
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	183	161
Actual return on plan assets	11	23
Company contributions	9	10
Benefits paid	(7)	(8)
Settlements	(5)	(6)
Effect of foreign currency exchange rate movements	(1)	3
Fair value of plan assets, December 31	190	183	$ 161
Funded status, December 31	(74)	(70)
Non-current asset	5	6
Current liability	(3)	(3)
Non-current liability	(76)	(73)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	$ (74)	$ (70)