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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 23, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Jan. 31, 2016
USD ($)
Debt Instrument [Line Items]                    
Short-term debt, weighted average interest rate         4.90% 1.49%        
Aggregate annual maturities of long-term debt, 2018         $ 823,000,000          
Aggregate annual maturities of long-term debt, 2019         2,200,000,000          
Aggregate annual maturities of long-term debt, 2020         2,800,000,000          
Aggregate annual maturities of long-term debt, 2021         1,200,000,000          
Aggregate annual maturities of long-term debt, 2021         3,800,000,000          
Debt Instrument, Repurchased Face Amount   $ 1,717,000,000 $ 1,689,000,000 $ 1,717,000,000            
Debt Instrument, Repurchase Amount   1,776,000,000 1,764,000,000 $ 1,776,000,000            
Long-Term Debt         18,667,000,000 $ 10,550,000,000        
Extinguishment of Debt, Gain (Loss), Net of Tax   $ 31,000,000 $ 42,000,000   $ (73,000,000) 0 $ 0      
1.000% Notes due December 15, 2022                    
Debt Instrument [Line Items]                    
Interest rate     1.00%   1.00%       1.00%  
Long-Term Debt         $ 586,000,000 0        
1.450% Notes due May 15, 2017                    
Debt Instrument [Line Items]                    
Interest rate         1.45%          
1.900% Notes due December 15, 2026                    
Debt Instrument [Line Items]                    
Interest rate     1.90%   1.90%       1.90%  
Long-Term Debt         $ 585,000,000 0        
0.368% Notes due June 6, 2019                    
Debt Instrument [Line Items]                    
Interest rate   0.368%   0.368% 0.368%     0.368%    
Long-Term Debt         $ 823,000,000 $ 0        
Domestic Debt | Former Syndicated Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity of syndicated credit facility                   $ 1,000,000,000
Domestic Debt | Syndicated Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity of syndicated credit facility         1,500,000,000.0          
Borrowings under credit facility         0          
Letters of credit issuable under credit facility         100,000,000          
Additional commitments made by the lenders         500,000,000          
Maximum aggregate commitment         $ 2,000,000,000          
Covenant compliance, minimum interest expense coverage ratio         4          
Domestic Debt | Term Loan Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity of syndicated credit facility   $ 2,250,000,000   $ 2,250,000,000            
Domestic Debt | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity of syndicated credit facility   2,250,000,000   2,250,000,000            
CR Bard Inc [Member]                    
Debt Instrument [Line Items]                    
Payments to acquire business secured bridge financing $ 15,700,000,000                  
CR Bard Inc [Member] | Issued Notes [Member]                    
Debt Instrument [Line Items]                    
Long-Term Debt   9,675,000,000   $ 9,675,000,000            
Debt Instrument, Redemption Price, Percentage       101.00%            
Euro Member Countries, Euro | 1.000% Notes due December 15, 2022                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €                 € 500  
Euro Member Countries, Euro | 1.900% Notes due December 15, 2026                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €                 € 500  
Euro Member Countries, Euro | 0.368% Notes due June 6, 2019                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €               € 700    
Long-term Debt [Member]                    
Debt Instrument [Line Items]                    
Long-Term Debt   $ 1,745,000,000 $ 1,727,000,000 $ 1,745,000,000