Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ 48	$ 275	$ (37)	$ (491)
Other comprehensive income (loss), tax	4	10	6	36
Other comprehensive income (loss), net of tax	44	265	(43)	(527)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	24	241	(67)	(700)
Other comprehensive income (loss), before reclassification, tax	0	4	0	(7)
Other comprehensive income (loss), before reclassification, net of tax	24	237	(67)	(693)
Reclassification from AOCI, net of tax	0	0	0	0
Other comprehensive income (loss), net of tax	24	237	(67)	(693)
Pension/Post-Retirement Plans Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	(16)	(3)	(52)	106
Reclassification from AOCI, before Tax	51	39	103	79
Reclassification from AOCI, tax	15	8	27	19
Reclassification from AOCI, net of tax	36	31	76	60
Other comprehensive income (loss), before tax	24	34	30	209
Other comprehensive income (loss), tax	4	6	6	43
Other comprehensive income (loss), net of tax	20	28	24	166
Prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	(1)	(1)	(1)	(1)
Reclassification from AOCI, tax	0	0	0	0
Reclassification from AOCI, net of tax	(1)	(1)	(1)	(1)
Net actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	52	40	104	80
Reclassification from AOCI, tax	15	8	27	19
Reclassification from AOCI, net of tax	37	32	77	61
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(44)	(5)	(81)	130
Other comprehensive income (loss), before reclassification, tax	(12)	(2)	(20)	24
Other comprehensive income (loss), before reclassification, net of tax	(32)	(3)	(61)	106
Other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax			(7)	0
Other comprehensive income (loss), before reclassification, tax			(2)	0
Other comprehensive income (loss), before reclassification, net of tax			(5)	0
Effect of remeasurement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	15	0	13	0
Other comprehensive income (loss), before reclassification, tax	1	0	1	0
Other comprehensive income (loss), before reclassification, net of tax	14	0	12	0
Effect of settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	2	0	2	0
Other comprehensive income (loss), before reclassification, tax	0	0	0	0
Other comprehensive income (loss), before reclassification, net of tax	$ 2	$ 0	$ 2	$ 0