Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax	$ (91)	$ (941)
Foreign currency translation adjustments, Tax	0	(11)
Foreign currency translation adjustments, Net of Tax	(91)	(930)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Net actuarial loss, Pre-Tax	52	40
Net actuarial loss, Tax	12	11
Net actuarial loss, Net of Tax	40	29
Subtotal, Pre-Tax	52	40
Subtotal, Tax	12	11
Subtotal, Net of Tax	40	29
Foreign currency translation adjustment, Pre-Tax	(37)	135
Foreign currency translation adjustment, Tax	(8)	26
Foreign currency translation adjustment, Net of Tax	(29)	109
Other adjustments, Pre-Tax	(7)	0
Other adjustments, Tax	(2)	0
Other adjustments, Net of Tax	(5)	0
Effect of remeasurement, Pre-tax	(2)	0
Effect of remeasurement, Tax	0	0
Effect of remeasurement, Net of Tax	(2)	0
Gain related to pension/post-retirement plans	6	175
Pension/post-retirement plans gains, Tax	2	37
Pension/post-retirement plans gains, Net of Tax	4	138
Other comprehensive loss, before tax	(85)	(766)
Other comprehensive (loss) income, Tax	2	26
Other comprehensive loss, net of tax	$ (87)	$ (792)