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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on interest rate swaps $ 1 $ (5) $ 0 $ (12)
Gain (loss) on long-term debt (1) 5 0 12
Cross-currency swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on interest rate swaps 1,308 (1,066) 884 (297)
Gain (loss) on long-term debt (1,308) 1,066 (884) 297
Gain (loss) recognized in accumulated OCI (412) 1,005 (482) 1,045
Gain (loss) recognized in accumulated OCI (5) 31 0 23
Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on interest rate swaps 0 1 0 12
Gain (loss) on long-term debt 0 (1) 0 (12)
Gain (loss) recognized in accumulated OCI 0 18 0 12
Interest rate locks | Interest income (expense)        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount reclassified from accumulated OCI into income $ (15) $ (15) $ (44) $ (44)