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Debt - Debt Exchange (Detail) - USD ($)
$ in Millions
5 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]      
Long-Term Debt $ 18,667   $ 10,550
CR Bard Inc [Member] | Exchanged Notes [Member]      
Debt Instrument [Line Items]      
Long-Term Debt   $ 1,150  
Principal Amount Accepted for Exchange 1,035    
CR Bard Inc [Member] | Exchanged Notes [Member] | Notes 4.400% due January 15, 2021 [Member]      
Debt Instrument [Line Items]      
Interest rate   4.40%  
Long-Term Debt   $ 500  
Principal Amount Accepted for Exchange 428    
CR Bard Inc [Member] | Exchanged Notes [Member] | Notes 3.000% due May 15, 2026 [Member]      
Debt Instrument [Line Items]      
Interest rate   3.00%  
Long-Term Debt   $ 500  
Principal Amount Accepted for Exchange 470    
CR Bard Inc [Member] | Exchanged Notes [Member] | Notes 6.700% due December 1, 2026 [Member]      
Debt Instrument [Line Items]      
Interest rate   6.70%  
Long-Term Debt   $ 150  
Principal Amount Accepted for Exchange $ 137