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Shareholders' Equity - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2022
Nov. 30, 2021
Sep. 24, 2013
Class of Stock [Line Items]        
Share repurchase program, authorized, number of shares       10,000
Share repurchase program, number of additional shares authorized to be repurchased     10,000  
Accelerated Share Repurchase Program        
Class of Stock [Line Items]        
Treasury stock, shares, acquired 2,118      
Share repurchase program, authorized, amount $ 500 $ 500    
Share repurchase program, excise tax, percentage 1.00%      
Share repurchase program, excise tax, amount $ 3      
Total shares to be delivered under accelerated share repurchase program   1,953    
Accelerated Share Repurchase Program, Agreement One        
Class of Stock [Line Items]        
Treasury stock, shares, acquired   462    
Treasury Stock        
Class of Stock [Line Items]        
Treasury stock, shares, acquired 2,118 2,415    
Treasury stock, value, acquired, cost method $ 503 $ 650    
Treasury Stock | Accelerated Share Repurchase Program        
Class of Stock [Line Items]        
Treasury stock, value, acquired, cost method   $ 150