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Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Oct. 05, 2014
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jul. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Feb. 29, 2016
USD ($)
Jan. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Mar. 17, 2015
USD ($)
Debt Instrument [Line Items]                          
Short-term debt, weighted average interest rate     0.64%       1.49% 0.64%          
Repayments of Unsecured Debt   $ 750,000,000                      
Aggregate annual maturities of long-term debt, 2016             $ 801,000,000            
Aggregate annual maturities of long-term debt, 2017             1,450,000,000            
Aggregate annual maturities of long-term debt, 2018             1,200,000,000            
Aggregate annual maturities of long-term debt, 2019             1,250,000,000            
Aggregate annual maturities of long-term debt, 2020             700,000,000            
Business combination interest and financing costs             183,000,000 $ 107,000,000          
Former Syndicated Credit Facility [Member] | Domestic Debt                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity of syndicated credit facility                   $ 1,000,000,000      
Syndicated Credit Facility | Domestic Debt                          
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             5            
Bridge Loan                          
Debt Instrument [Line Items]                          
Payments to acquire business secured bridge financing $ 9,100,000,000                        
Term Loan Facility                          
Debt Instrument [Line Items]                          
Short term debt maximum borrowing capacity           $ 1,000,000,000              
Repayments of short-term debt     $ 100,000,000 $ 250,000,000 $ 650,000,000                
Debt instrument, term           364 days              
Notes Due 2016                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                     $ 500,000,000    
1.450% Notes due May 15, 2017                          
Debt Instrument [Line Items]                          
Debt instrument, face amount   $ 300,000,000                      
Notes Due June 2016                          
Debt Instrument [Line Items]                          
Debt instrument, face amount     750,000,000         750,000,000          
Unsecured Debt                          
Debt Instrument [Line Items]                          
Debt instrument, face amount           $ 6,200,000,000.0              
Care Fusion Corporation                          
Debt Instrument [Line Items]                          
Long-term debt assumed                         $ 2,181,000,000
Care Fusion Corporation | Unsecured Debt                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                       $ 2,000,000,000  
Long-term debt assumed                         $ 2,174,000,000
Commercial Paper Program                          
Debt Instrument [Line Items]                          
Short Term Debt Former Maximum Borrowing Capacity                 $ 1,000,000,000        
Short term debt maximum borrowing capacity                 $ 1,500,000,000        
Repayments of short-term debt             $ 500,000,000            
Commercial Paper Program | Care Fusion Corporation                          
Debt Instrument [Line Items]                          
Used proceeds of new financing     $ 500,000,000         $ 500,000,000