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Acquisitions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2017
Jun. 30, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Dec. 29, 2017
Business Acquisition [Line Items]            
Proceeds from issuance of equity securities $ 4,800,000,000 $ 4,800,000,000 $ 0 $ 0 $ 4,827,000,000  
BusinessCombinationConsiderationTransferredEquityInterestsRecognizedAsIncreaseToAdditionalPaidInCapitalCommonStock           $ 6,500,000,000
BusinessCombinationConsiderationTransferredEquityInterestsRecognizedAsDecreaseToTreasuryStock           2,100,000,000
TransitionTaxPayableAcquiree           $ 183,000,000
CR Bard Inc            
Business Acquisition [Line Items]            
Cash consideration per share (USD per share)           $ 222.93
Conversion factor           0.5077
Proceeds from Issuance of Debt   $ 9,600,000,000        
Business Acquisition, Goodwill, Expected Tax Deductible Amount     $ 0      
Product liability and other legal reserves           $ 2,004,000,000
Business Combination, Acquisition Related Costs       56,000,000 $ 25,000,000  
Business combination, pro forma information, revenue of acquiree since acquisition date,       3,000,000,000    
Business combination, pro forma information, loss of acquiree since acquisition date       107,000,000    
Recognition Of Fair Value Adjustment To Inventory Acquired       $ 478,000,000    
CR Bard Inc | Developed Technology            
Business Acquisition [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     14 years      
CR Bard Inc | Customer relationships            
Business Acquisition [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     13 years      
CR Bard Inc | Measurement Input, Discount Rate | Developed Technology            
Business Acquisition [Line Items]            
Business Combination Intangible Asset Measurement Input     8.00%      
CR Bard Inc | Measurement Input, Discount Rate | Customer relationships            
Business Acquisition [Line Items]            
Business Combination Intangible Asset Measurement Input     8.00%