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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
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, derivatives $ 9 $ 7
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
Derivatives in fair value hedging relationships, derivative $ 93 $ (60)
Derivatives in fair value hedging relationships, hedged item (92) 60
Interest Rate Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, derivatives 5 3
Foreign exchange and other option and futures contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, derivatives $ 4 $ 4