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Financial Instruments - Long-Term Debt Narrative (Details) - USD ($)
12 Months Ended
Nov. 21, 2016
Jun. 03, 2016
Dec. 31, 2016
Oct. 31, 2015
Oct. 05, 2015
Sep. 03, 2015
Debt Instrument [Line Items]            
Repurchased debt $ 3,400,000,000          
Redemption value 3,700,000,000          
Loss on early redemption of debt 312,000,000   $ 312,000,000      
Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 6,000,000,000 $ 5,000,000,000        
Weighted average interest rate 3.10% 2.09%        
Redemption price, percentage 100.00% 100.00% 100.00%      
Unsecured Debt [Member] | US Treasury Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Debt redemption price, basis spread percentage 0.10% 0.05% 0.05%      
Unsecured Debt [Member] | US Treasury Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Debt redemption price, basis spread percentage 0.20% 0.15% 0.50%      
Unsecured Debt [Member] | Senior Unsecured Notes, Due 2019 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 1,000,000,000          
Unsecured Debt [Member] | Senior Unsecured Notes, Due 2021 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount 1,000,000,000          
Unsecured Debt [Member] | Senior Unsecured Notes, Due 2026 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount 1,750,000,000          
Unsecured Debt [Member] | Senior Unsecured Notes, Due 2036 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount 1,000,000,000          
Unsecured Debt [Member] | Senior Unsecured Notes, Due 2046 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount 1,250,000,000          
Unsecured Debt [Member] | Senior Unsecured Debt, 6.20%, Due 2019 [Member]            
Debt Instrument [Line Items]            
Repurchased debt $ 3,270,000,000          
Interest rate, percentage     6.20%      
Hospira [Member]            
Debt Instrument [Line Items]            
Fair value of debt acquired           $ 1,928,000,000
Hospira [Member] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 1,700,000,000 $ 1,700,000,000 $ 1,750,000,000