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Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 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 $ 4 $ 1 $ 4 $ 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 $ (2) 4 $ (3) (6)    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments (2) 4 (3) (6)    
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 (1) 0 (1)    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments 0 (1) 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 (4) 3 6    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments 2 (4) 3 6    
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 (532) 559 (594) 849    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments (532) 559 (594) 849    
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 (23) (28) (25) (28)    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments (23) (28) (25) (28)    
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 33 0 33 0    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments 33 0 33 0    
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 (70) 0 (166)    
Warrants [Abstract]            
Gains and losses due to changes in fair value of derivative instruments $ 0 $ (70) $ 0 $ (166)    
Warrants Exercisable in March 2016 [Member] | AmerisourceBergen Corporation [Member]            
Class of Warrant or Right [Line Items]            
Warrant exercise price (in dollars per share) $ 51.50   $ 51.50      
Warrants Exercisable in March 2016 [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      
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] $ 465   $ 465   1,205  
Derivatives assets, Fair Value 1   1   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 5   5   2  
Other Non-currents Assets [Member] | Warrants [Member] | Not Designated as Hedging Instrument [Member]            
Warrants [Abstract]            
Derivative asset 1,546   1,546   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] 768   768   495  
Derivatives assets, Fair Value $ 16   $ 16   $ 9  
[1] Amounts are presented in U.S. dollar equivalents.