Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ (142)	$ 427	$ (179)	$ (64)
Other comprehensive income (loss), tax	50	(7)	56	29
Other comprehensive (loss) income, net of tax	(192)	434	(235)	(93)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	(346)	500	(413)	(200)
Other comprehensive income (loss), before reclassification, tax	0	3	0	(4)
Other comprehensive income (loss), before reclassification, net of tax	(346)	497	(413)	(196)
Reclassification from AOCI, net of tax	0	0	0	0
Other comprehensive (loss) income, net of tax	(346)	497	(413)	(196)
Pension/Post-Retirement Plans Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, net of tax	115	(94)	63	12
Reclassification from AOCI, before Tax	52	40	155	119
Reclassification from AOCI, tax	13	9	40	28
Reclassification from AOCI, net of tax	39	31	115	91
Other comprehensive income (loss), before tax	204	(73)	234	136
Other comprehensive income (loss), tax	50	(10)	56	33
Other comprehensive (loss) income, net of tax	154	(63)	178	103
Prior service credits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax			(1)	(1)
Reclassification from AOCI, tax			0	0
Reclassification from AOCI, net of tax			(1)	(1)
Net actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	52	40	156	120
Reclassification from AOCI, tax	13	9	40	28
Reclassification from AOCI, net of tax	39	31	116	92
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax	88	(113)	7	17
Other comprehensive income (loss), before reclassification, tax	21	(19)	1	5
Other comprehensive income (loss), before reclassification, net of tax	67	(94)	6	12
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	64	0	77	0
Other comprehensive income (loss), before reclassification, tax	16	0	17	0
Other comprehensive income (loss), before reclassification, net of tax	$ 48	$ 0	60	0
Effect of settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassification, before tax			2	0
Other comprehensive income (loss), before reclassification, tax			0	0
Other comprehensive income (loss), before reclassification, net of tax			$ 2	$ 0