Accumulated Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	$ 376	$ (180)
Reclassification from AOCI, net of tax	159	125
Other comprehensive income (loss), before tax	840	(225)	$ (554)
Other comprehensive income (loss), tax	305	(170)	(146)
Other comprehensive income (loss), net of tax	535	(55)	(408)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(389)	559	148
Other comprehensive income (loss), before reclassification, tax	0	0	(3)
Other comprehensive income (loss), before reclassification, net of tax	(389)	559	151
Reclassification from AOCI, net of tax	0	0
Other comprehensive income (loss), net of tax	(389)	559
Pension and Post-Retirement Plans Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	765	(739)
Reclassification from AOCI, before tax	213	162	106
Reclassification from AOCI, tax	54	37	22
Reclassification from AOCI, net of tax	159	125	84
Other comprehensive income (loss), before tax	1,229	(784)	(702)
Other comprehensive income (loss), tax	305	(170)	(143)
Other comprehensive income (loss), net of tax	924	(614)	(559)
Prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before tax	(2)	(2)	(2)
Reclassification from AOCI, tax	0	(1)	(1)
Reclassification from AOCI, net of tax	(2)	(1)	(1)
Net Actuarial (Loss) Gain
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before tax	208	161	102
Reclassification from AOCI, tax	52	37	22
Reclassification from AOCI, net of tax	156	124	80
Effect of curtailment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before tax	2
Reclassification from AOCI, tax	1
Reclassification from AOCI, net of tax	1
Effect of settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before tax	5	3	6
Reclassification from AOCI, tax	1	1	1
Reclassification from AOCI, net of tax	4	2	5
Net gains arising during period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	1,003	(772)	(758)
Other comprehensive income (loss), before reclassification, tax	249	(177)	(154)
Other comprehensive income (loss), before reclassification, net of tax	754	(595)	(604)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	19	(163)	(50)
Other comprehensive income (loss), before reclassification, tax	4	(28)	(11)
Other comprehensive income (loss), before reclassification, net of tax	15	(135)	$ (39)
Other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(6)	(11)
Other comprehensive income (loss), before reclassification, tax	(2)	(2)
Other comprehensive income (loss), before reclassification, net of tax	$ (4)	$ (9)