Financial Instruments (Schedule Of Derivative Instruments) (Details) € in Millions, lb in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022 USD ($) lb	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) lb	Mar. 31, 2021 USD ($)	Sep. 30, 2019 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified to earnings	$ 23	$ 40	$ 77	$ 40
Other Comprehensive Income (Loss), Total	57	64	117	29
Commodity Contract [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified to earnings	6	8	13	11
Commodity Contract [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to other comprehensive income	10	13	23	26
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of foreign currency hedge positions	2,600		2,600
Foreign Exchange Contract [Member] | Other deductions, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified to earnings	8	29	52	25
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified to earnings	9	2	11	2
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to other comprehensive income	14	0	17	27
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified to earnings	0	1	1	2
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Sales [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to other comprehensive income	(2)	(2)	(2)	3
Foreign Exchange Contract [Member] | Net Investment Hedging [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to other comprehensive income	35	$ 53	79	$ (27)
All Commodity Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of commodities hedged	$ 120		$ 120
Copper and Aluminum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weight in pounds of copper and aluminum commodity hedges | lb	32		32
Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt, face amount | €					€ 1,500