Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated OCI				$ (1,857)
Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax	$ 0	$ 0	$ 0	(12)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	(5)	(1)	(12)	(3)
Gain (loss) on long-term debt	5	1	12	3
Cross-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	(1,066)	(52)	(297)	7
Gain (loss) on long-term debt	1,066	52	297	(7)
Gain (loss) recognized in accumulated OCI	1,005	12	1,045	(48)
Gain (loss) recognized in accumulated OCI	31	(690)	23	(1,077)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	1	(37)	12	(60)
Gain (loss) on long-term debt	(1)	37	(12)	60
Gain (loss) recognized in accumulated OCI	18	(5)	12	(9)
Gain (loss) recognized in accumulated OCI	0	0	0	3
Foreign exchange contracts | Other income (expense) - net
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	0	0	0	1
Interest rate locks | Other income (expense) - net
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	0	0	0	(45)
Interest rate locks | Interest income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from accumulated OCI into income	$ (15)	$ (15)	$ (44)	$ (51)