Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	$ 0	$ 7
Gain (loss) on long-term debt	0	(7)
Cross-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	(246)	380
Gain (loss) on long-term debt	246	(380)
Gain (loss) recognized in accumulated OCI	255	(182)
Gain (loss) recognized in accumulated OCI	5	(10)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	0	7
Gain (loss) on long-term debt	0	(7)
Gain (loss) recognized in accumulated OCI	0	(3)
Interest rate locks | Interest income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	$ (15)	$ (15)