Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated OCI			$ (1,857)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	$ 7	$ (1)
Gain (loss) on long-term debt	(7)	1
Cross-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	380	(37)
Gain (loss) on long-term debt	(380)	37
Gain (loss) recognized in accumulated OCI	(182)	9
Gain (loss) recognized in accumulated OCI	(10)	315
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	7	0
Gain (loss) on long-term debt	(7)	0
Gain (loss) recognized in accumulated OCI	(3)	0
Gain (loss) recognized in accumulated OCI	0	3
Foreign exchange contracts | Other income (expense) - net
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	0	1
Interest rate locks | Interest income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	$ (15)	$ (20)