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Borrowing and Credit Agreements - Additional Information (Details) - USD ($)
1 Months Ended 4 Months Ended 12 Months Ended
Jul. 20, 2015
May. 20, 2015
Sep. 04, 2014
Aug. 07, 2014
Dec. 02, 2013
Aug. 31, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]                    
Weighted average interest rate                 0.36%  
Proceeds from issuance of senior long-term debt       $ 1,500,000,000 $ 4,000,000,000          
Carrying amount of long-term debt             $ 27,500,000,000 $ 27,500,000,000    
Loss on early extinguishment of debt               0 $ 521,000,000 $ 0
Total debt principal             27,694,000,000 27,694,000,000 $ 12,992,000,000  
Omnicare, Inc.                    
Debt Instrument [Line Items]                    
Notes assumed           $ 3,100,000,000        
Convertible debt             5,000,000 5,000,000    
Repayments of debt               2,400,000,000    
Carrying amount of long-term debt           700,000,000        
Senior notes 1.900% due in 2018, 2.800% due in 2020, 3.500% due in 2022, 4.875% due in 2035, and 5.125% due in 2045                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 15,000,000,000                  
Bridge Loan                    
Debt Instrument [Line Items]                    
Bridge loan   $ 13,000,000,000                
Loan processing fee   $ 52,000,000                
Unsecured Backup Credit Facility Expiring May 2016                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity             1,000,000,000.00 $ 1,000,000,000.00    
Line of credit facility term (in years)               5 years    
Unsecured Backup Credit Facility Expiring February 2017                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity             1,250,000,000.00 $ 1,250,000,000.00    
Line of credit facility term (in years)               5 years    
Unsecured Backup Credit Facility Expiring May 2018                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity             1,250,000,000.00 $ 1,250,000,000.00    
Line of credit facility term (in years)               5 years    
Unsecured Backup Credit Facilities                    
Debt Instrument [Line Items]                    
Commitment fee percentage               0.03%    
Long-term line of credit             0 $ 0    
Unsecured Debt                    
Debt Instrument [Line Items]                    
Proceeds from issuance of senior long-term debt 14,800,000,000                  
Unsecured Debt | 1.9% senior notes due 2018                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 2,250,000,000.00                  
Interest rate, stated percentage 1.90%                  
Unsecured Debt | 2.8% senior notes due 2020                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 2,750,000,000.00                  
Interest rate, stated percentage 2.80%                  
Unsecured Debt | 3.5% senior notes due 2022                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 1,500,000,000.0                  
Interest rate, stated percentage 3.50%                  
Unsecured Debt | 3.875% senior notes due 2025                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 3,000,000,000                  
Interest rate, stated percentage 3.875%                  
Unsecured Debt | 4.875% senior notes due 2035                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 2,000,000,000                  
Interest rate, stated percentage 4.875%                  
Unsecured Debt | 5.125% senior notes due 2045                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 3,500,000,000.0                  
Interest rate, stated percentage 5.125%                  
Convertible Debt | Omnicare, Inc.                    
Debt Instrument [Line Items]                    
Notes assumed           2,000,000,000        
Loans Payable | Omnicare, Inc.                    
Debt Instrument [Line Items]                    
Repayments of debt             $ 400,000,000      
Senior Notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           684,000,000        
Senior Notes | 4.750% senior notes due in 2022                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           388,000,000        
Senior Notes | 4.750% senior notes due in 2022 | Omnicare, Inc.                    
Debt Instrument [Line Items]                    
Carrying amount of long-term debt           400,000,000        
Senior Notes | 5% senior notes due 2024                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           296,000,000        
Senior Notes | 5% senior notes due 2024 | Omnicare, Inc.                    
Debt Instrument [Line Items]                    
Carrying amount of long-term debt           $ 300,000,000        
2.25% senior notes due 2019                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 850,000,000            
Interest rate, stated percentage       2.25%     2.25% 2.25% 2.25%  
Total debt principal             $ 850,000,000 $ 850,000,000 $ 850,000,000  
3.375% senior notes due 2024                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 650,000,000            
Interest rate, stated percentage       3.375%     3.375% 3.375% 3.375%  
Total debt principal             $ 650,000,000 $ 650,000,000 $ 650,000,000  
6.25% senior notes due 2027                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage       6.25%     6.25% 6.25% 6.25%  
Total debt principal             $ 453,000,000 $ 453,000,000 $ 453,000,000  
6.125% senior notes due 2039                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage       6.125%     6.125% 6.125% 6.125%  
Total debt principal             $ 734,000,000 $ 734,000,000 $ 734,000,000  
5.75% senior notes due 2041                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage       5.75%     5.75% 5.75% 5.75%  
Total debt principal             $ 493,000,000 $ 493,000,000 $ 493,000,000  
5.75% senior notes due 2017                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage       5.75%     5.75% 5.75% 5.75%  
Total debt principal             $ 1,080,000,000 $ 1,080,000,000 $ 1,080,000,000  
Senior notes 6.25% Due in 2027, 6.125% Due in 2039, 5.75% Due in 2041, 5.75% Due in 2017                    
Debt Instrument [Line Items]                    
Extinguishment of debt amount tender offer     $ 2,000,000,000.0 $ 1,500,000,000.0            
Redemption premium     490,000,000              
Write-off of unamortized deferred financing charges     26,000,000              
Extinguishment of debt tender fees     5,000,000              
Loss on early extinguishment of debt     $ 521,000,000              
Enhanced Capital Advantage Preferred Securities                    
Debt Instrument [Line Items]                    
Total debt principal                 $ 41,000,000  
Unsecured Senior Notes 1.25% Due in 2016                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 750,000,000          
Interest rate, stated percentage         1.20%          
2.25% senior notes due 2018                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 1,250,000,000.00          
Interest rate, stated percentage         2.25%   2.25% 2.25% 2.25%  
Total debt principal             $ 1,250,000,000 $ 1,250,000,000 $ 1,250,000,000  
4% senior notes due 2023                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 1,250,000,000.00          
Interest rate, stated percentage         4.00%   4.00% 4.00% 4.00%  
Total debt principal             $ 1,250,000,000 $ 1,250,000,000 $ 1,250,000,000  
5.3% senior notes due 2043                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 750,000,000          
Interest rate, stated percentage         5.30%   5.30% 5.30% 5.30%  
Total debt principal             $ 750,000,000 $ 750,000,000 $ 750,000,000  
4.75% senior notes due 2022                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage             4.75% 4.75% 4.75%  
Total debt principal             $ 400,000,000 $ 400,000,000 $ 0  
5% senior notes due 2024                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage             5.00% 5.00% 5.00%  
Total debt principal             $ 300,000,000 $ 300,000,000 $ 0