Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ (83)	$ (85)
Other comprehensive income (loss), tax	21	2
Other comprehensive loss, net of tax	(104)	(87)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(169)	(91)
Other comprehensive income (loss), before reclassification, tax	0	0
Other comprehensive income (loss), before reclassification, net of tax	(169)	(91)
Reclassification from AOCI, net of tax	0	0
Other comprehensive loss, net of tax	(169)	(91)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	35	(36)
Reclassification from AOCI, before Tax	39	52
Reclassification from AOCI, tax	9	12
Reclassification from AOCI, net of tax	30	40
Other comprehensive income (loss), before tax	86	6
Other comprehensive income (loss), tax	21	2
Other comprehensive loss, net of tax	65	4
Net actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	39	52
Reclassification from AOCI, tax	9	12
Reclassification from AOCI, net of tax	30	40
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	65	(37)
Other comprehensive income (loss), before reclassification, tax	16	(8)
Other comprehensive income (loss), before reclassification, net of tax	49	(29)
Other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(18)	(7)
Other comprehensive income (loss), before reclassification, tax	(4)	(2)
Other comprehensive income (loss), before reclassification, net of tax	(14)	(5)
Effect of re-measurement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	0	(2)
Other comprehensive income (loss), before reclassification, tax	0	0
Other comprehensive income (loss), before reclassification, net of tax	$ 0	$ (2)