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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2024
Jun. 30, 2024
Jun. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Supplier finance program, obligation     $ 211 $ 112
Research and Development Expense        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairment charges $ 30      
Integration, Restructuring and Transaction Expense        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairment charges   $ 42    
Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maturity period of short-term investments at the time of purchase     3 months  
Payment terms of supplier finance programs (in days)     90 days  
Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maturity period of short-term investments at the time of purchase     1 year  
Payment terms of supplier finance programs (in days)     150 days