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Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives $ 7 $ 14 $ 14 $ 26
Interest rate swap agreements | Fixed Rate Long-Term Borrowings | Designated as Hedging Instrument | Fair value hedges:        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other costs of operations Other costs of operations Other costs of operations Other costs of operations
Derivatives in fair value hedging relationships, derivative $ (18) $ (46) $ (78) $ (34)
Derivatives in fair value hedging relationships, hedged item 18 47 78 35
Interest Rate Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives 3 11 6 19
Foreign exchange and other option and futures contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives $ 4 $ 3 $ 8 $ 7