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Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 18, 2016
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Aug. 31, 2015
Aug. 10, 2015
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Cumulative fair value adjustments resulted in increase in long-term debt   $ 3   $ 3   $ 1  
Interest Rate Swaps [Member] | One-month LIBOR [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Fair Value   $ 250   $ 250      
Fixed interest rate percentage   5.25%   5.25%      
Interest Rate Swaps [Member] | Six-month LIBOR [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Fair Value   $ 750   $ 750      
Fixed interest rate percentage   5.25%   5.25%      
Cash Flow Hedges [Abstract]              
Derivative notional amount terminated             $ 500
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Interest Expense, Net [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   $ 1 $ 7 $ (2) $ (13)    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   1 7 (2) (13)    
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Interest Expense, Net [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   0 0 0 1    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   0 0 0 1    
Notes [Member] | Designated as Hedging Instrument [Member] | Interest Expense, Net [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   (2) (7) 1 13    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   (2) (7) 1 13    
Warrants [Member] | Other Income (Expense) [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   (268) 449 (862) 1,298    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   (268) 449 (862) 1,298    
Foreign Currency Forwards [Member] | Not Designated as Hedging Instrument [Member] | Selling, General and Administrative Expenses [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   24 49 (1) 38    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   24 49 (1) 38    
Foreign Currency Forwards [Member] | Not Designated as Hedging Instrument [Member] | Other Income (Expense) [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   4 7 37 17    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   4 7 37 17    
Second Step Transaction Foreign Currency Forwards [Member] | Not Designated as Hedging Instrument [Member] | Other Income (Expense) [Member]              
Effect of Fair Value Hedges on Results of Operations [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   0 0 0 (166)    
Warrants [Abstract]              
Gains and losses due to changes in fair value of derivative instruments   $ 0 $ 0 $ 0 $ (166)    
AmerisourceBergen Corporation [Member]              
Class of Warrant or Right [Line Items]              
Warrant issued to purchase common stock (in shares) 22,696,912            
Warrant exercise price (in dollars per share) $ 51.50            
Warrants aggregate exercise price payment $ 1,170            
Warrants Exercisable in March 2016 [Member] | AmerisourceBergen Corporation [Member]              
Class of Warrant or Right [Line Items]              
Warrant issued to purchase common stock (in shares) 22,696,912            
Warrant exercise price (in dollars per share) $ 51.50            
Warrants Exercisable in March 2017 [Member] | AmerisourceBergen Corporation [Member]              
Class of Warrant or Right [Line Items]              
Warrant exercise price (in dollars per share)   $ 52.50   $ 52.50      
Warrants Exercisable in March 2017 [Member] | AmerisourceBergen Corporation [Member] | Maximum [Member]              
Class of Warrant or Right [Line Items]              
Warrant issued to purchase common stock (in shares)   22,696,912   22,696,912      
Other Current Assets [Member] | Basis Swaps [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Notional Amount [1]           1  
Derivatives assets, Fair Value           0  
Other Current Assets [Member] | Foreign Currency Forwards [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Notional Amount [1]   $ 1,082   $ 1,082   1,205  
Derivatives assets, Fair Value   17   17   34  
Other Non-currents Assets [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Notional Amount [1]   250   250   250  
Derivatives assets, Fair Value   4   4   2  
Other Non-currents Assets [Member] | Warrants [Member] | Not Designated as Hedging Instrument [Member]              
Warrants [Abstract]              
Derivative asset   498   498   2,140  
Other Current Liabilities [Member] | Basis Swaps [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Notional Amount [1]   2   2      
Derivatives assets, Fair Value   $ 1   $ 1      
Other Current Liabilities [Member] | Foreign Currency Forwards [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Derivatives assets, Notional Amount [1]           495  
Derivatives assets, Fair Value           $ 9  
[1] Amounts are presented in U.S. dollar equivalents.