Accumulated Other Comprehensive (Loss) Income (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	$ 5	$ (849)
Other comprehensive income (loss), before tax	(114)	(557)	$ 840
Other comprehensive income (loss), tax	(133)	182	305
Other comprehensive income (loss), net of tax	19	(739)	535
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	389	(1,198)	(389)
Other comprehensive income (loss), before reclassification, tax	(10)	22	0
Other comprehensive income (loss), before reclassification, net of tax	399	(1,220)	(389)
Other comprehensive income (loss), net of tax	399	(1,220)
Pension/Post-Retirement Plans Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	(394)	371
Recognized as component of net benefit cost (credit)	20	150	213
Reclassification from AOCI, tax	6	38	54
Reclassification from AOCI, net of tax	14	112	159
Other comprehensive income (loss), before tax	(503)	641	1,229
Other comprehensive income (loss), tax	(123)	160	305
Other comprehensive income (loss), net of tax	(380)	481	924
Prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Recognized as component of net benefit cost (credit)	(2)	(2)	(2)
Reclassification from AOCI, tax	0	0	0
Reclassification from AOCI, net of tax	(2)	(2)	(2)
Net actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Recognized as component of net benefit cost (credit)	20	150	208
Reclassification from AOCI, tax	5	38	52
Reclassification from AOCI, net of tax	15	112	156
Effect of curtailment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Recognized as component of net benefit cost (credit)			2
Reclassification from AOCI, tax			1
Reclassification from AOCI, net of tax			1
Effect of settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Recognized as component of net benefit cost (credit)	2	2	5
Reclassification from AOCI, tax	1	0	1
Reclassification from AOCI, net of tax	1	2	4
Net gains arising during period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(349)	203	1,003
Other comprehensive income (loss), before reclassification, tax	(85)	51	249
Other comprehensive income (loss), before reclassification, net of tax	(264)	152	754
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(167)	285	19
Other comprehensive income (loss), before reclassification, tax	(42)	71	4
Other comprehensive income (loss), before reclassification, net of tax	(125)	214	15
Other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(7)	3	(6)
Other comprehensive income (loss), before reclassification, tax	(2)	0	(2)
Other comprehensive income (loss), before reclassification, net of tax	$ (5)	$ 3	$ (4)