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Summary of Significant Accounting Policies (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Jul. 13, 2025
Summary of Significant Accounting Policies [Line Items]        
Depreciation and amortization expense $ 728 $ 676 $ 696  
Selling and administrative expense 5,278 4,857 4,719  
Shipping and Handling        
Summary of Significant Accounting Policies [Line Items]        
Selling and administrative expense $ 736 $ 702 $ 733  
Waters Corporation | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration       $ 4,000
Disposal Group, Including Discontinued Operation, Debt       $ 4,000
Minimum | Developed technology        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 15 years      
Minimum | Customer relationships        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 10 years      
Minimum | Patents, Trademarks, and Other        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 1 year      
Minimum | Buildings        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 20 years      
Minimum | Machinery and Equipment        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 4 years      
Minimum | Leasehold Improvements        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 1 year      
Maximum | Developed technology        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 20 years      
Maximum | Customer relationships        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 15 years      
Maximum | Patents, Trademarks, and Other        
Summary of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, useful life 40 years      
Maximum | Buildings        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 45 years      
Maximum | Machinery and Equipment        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 20 years      
Maximum | Leasehold Improvements        
Summary of Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 20 years      
Waters Corporation        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Subsidiary, Ownership Percentage, Parent       39.20%
Subsidiary, Ownership Percentage, Noncontrolling Owner       60.80%