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Debt - Additional Information (Detail)
€ in Millions, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 29, 2017
USD ($)
Jan. 31, 2018
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities           $ 20,350,000,000       $ 18,667,000,000
Debt Instrument, Repurchased Face Amount           539,000,000     $ 461,000,000  
Debt Instrument, Repurchase Amount           559,000,000     465,000,000  
Extinguishment of Debt, Gain (Loss), Net of Tax     $ 3,000,000 $ 13,000,000            
Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Term         3 years          
Line of Credit Facility, Current Borrowing Capacity           2,250,000,000        
Long-term Line of Credit           1,230,000,000        
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Term         5 years          
Line of Credit Facility, Current Borrowing Capacity           2,250,000,000        
Long-term Line of Credit           200,000,000        
Syndicated Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity           $ 1,500,000,000        
Exchanged Notes [Member] | CR Bard Inc                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities $ 1,150,000,000                  
Principal Amount Accepted for Exchange 1,039,000,000                  
Long-term Debt, Excluding Current Maturities 111,000,000                  
Notes 3.000% due May 15, 2026 [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities                 $ 452,000,000  
Notes 3.000% due May 15, 2026 [Member] | Exchanged Notes [Member]                    
Debt Instrument [Line Items]                    
Debt repurchase offer, percentage of principal   101.00%                
Notes 3.000% due May 15, 2026 [Member] | Exchanged Notes [Member] | CR Bard Inc                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities 500,000,000                  
Principal Amount Accepted for Exchange 470,000,000                  
Stated interest rate         3.00% 3.00% 3.00%      
Notes 4.400% due January 15, 2021 [Member] | Exchanged Notes [Member] | CR Bard Inc                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities 500,000,000                  
Principal Amount Accepted for Exchange 432,000,000                  
Stated interest rate         4.40% 4.40% 4.40%      
Notes 4.400% due January 15, 2021 and notes 3.000% due May 15, 2026 [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities           $ 556,000,000        
Notes 6.700% due December 1, 2026 [Member] | Exchanged Notes [Member] | CR Bard Inc                    
Debt Instrument [Line Items]                    
Long-term Debt, Excluding Current Maturities 150,000,000                  
Principal Amount Accepted for Exchange $ 137,000,000                  
Stated interest rate         6.70% 6.70% 6.70%      
Notes0.368DueJune2019 [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate               0.368% 0.368%  
Debt Instrument, Face Amount               € 300 $ 370,000,000  
FloatingRateNotesDueFebruary2020 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                 $ 1,000,000,000  
Notes 1.401% due May 24, 2023 [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate         1.401% 1.401% 1.401%      
Debt Instrument, Face Amount         € 300 $ 354,000,000        
Notes 3.02% due May 24, 2025 [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate         3.02% 3.02% 3.02%      
Debt Instrument, Face Amount           $ 337,500,000 £ 250