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Debt and Financing Arrangements (Details Textual)
3 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Bank
Jan. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
Bank
Jan. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
Bank
Apr. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]              
Debt instrument face amount $ 5,150,000,000   $ 5,150,000,000   $ 5,150,000,000 $ 5,950,000,000  
Repayments of long-term debt     $ 800,000,000 $ 100,000,000      
Number of banks | Bank 11   11   11    
Revolving credit facility maximum borrowing capacity $ 1,500,000,000.0   $ 1,500,000,000.0   $ 1,500,000,000.0    
Percentage of the principal amount thereof which company can prepay 100.00%   100.00%   100.00%    
Interest paid $ 4,200,000 $ 18,000,000 $ 89,800,000 $ 54,900,000      
Commercial paper, borrowing capacity 1,000,000,000   1,000,000,000   $ 1,000,000,000    
Short-term borrowings 138,000,000   138,000,000   138,000,000 226,000,000  
Senior Notes [Member]              
Debt and Financing Arrangements (Textual) [Abstract]              
Debt instrument face amount             $ 3,700,000,000.0
3.50% Senior Notes due October 15, 2021 [Member]              
Debt and Financing Arrangements (Textual) [Abstract]              
Debt instrument face amount 750,000,000   750,000,000   750,000,000 750,000,000  
Term Loan Credit Agreement due March 23, 2020 [Member]              
Debt and Financing Arrangements (Textual) [Abstract]              
Debt instrument face amount $ 750,000,000   $ 750,000,000   $ 750,000,000 1,550,000,000 $ 1,800,000,000
Weighted average interest rate on long-term debt 1.68%   1.68%   1.68%    
Repayments of long-term debt $ 350,000,000   $ 800,000,000   $ 1,000,000,000    
Percent of original principal to be paid quarterly 2.50%            
Long-term Debt [Member]              
Debt and Financing Arrangements (Textual) [Abstract]              
Increase to long term-debt related to termination of interest rate swap     $ 45,700,000        
Commercial Paper [Member]              
Debt and Financing Arrangements (Textual) [Abstract]              
Commercial paper weighted-average interest rate 0.65%   0.65%   0.65%    
Cash Flow Hedging [Member]              
Outstanding derivative contracts              
Gain (loss) on early termination agreement           (4,000,000)  
Fair Value Hedging [Member]              
Outstanding derivative contracts              
Gain (loss) on early termination agreement           58,100,000  
Deferred gain on sale           $ 53,500,000