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Debt - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Dec. 29, 2017
Jan. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities     $ 22,095 $ 18,667
Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity     2,250  
Long-term Line of Credit     2,250  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity     2,250  
Syndicated Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity     1,500  
Exchanged Notes [Member] | CR Bard Inc [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities     $ 111  
Principal Amount Accepted for Exchange $ 1,039      
Long-term Debt, Excluding Current Maturities 1,150      
Notes 4.400% due January 15, 2021 [Member] | Exchanged Notes [Member] | CR Bard Inc [Member]        
Debt Instrument [Line Items]        
Principal Amount Accepted for Exchange 432      
Long-term Debt, Excluding Current Maturities 500      
Stated interest rate     4.40%  
Notes 3.000% due May 15, 2026 [Member] | Exchanged Notes [Member] | CR Bard Inc [Member]        
Debt Instrument [Line Items]        
Principal Amount Accepted for Exchange 470      
Long-term Debt, Excluding Current Maturities 500      
Stated interest rate     3.00%  
Notes 6.700% due December 1, 2026 [Member] | Exchanged Notes [Member] | CR Bard Inc [Member]        
Debt Instrument [Line Items]        
Principal Amount Accepted for Exchange 137      
Long-term Debt, Excluding Current Maturities $ 150      
Stated interest rate     6.70%  
Subsequent Event | Notes 3.000% due May 15, 2026 [Member] | Exchanged Notes [Member]        
Debt Instrument [Line Items]        
Debt repurchase offer, percentage of principal   101.00%