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Debt and Financing Arrangements (Details) - USD ($)
Apr. 30, 2018
Apr. 30, 2017
Debt Instrument [Line Items]    
Debt instrument face amount $ 4,700,000,000 $ 4,950,000,000
Long-term debt [1] 4,688,000,000 4,944,500,000
Current portion of long-term debt [1] 0 499,000,000
Long-term debt, less current portion [1] 4,688,000,000 4,445,500,000
Current Portion Of Long Term Debt [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount 0 500,000,000
Total Long Term Debt Less Current Portion [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount 4,700,000,000 4,450,000,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 800,000,000  
1.75% Senior Notes due March 15, 2018 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 1.75%  
Debt instrument face amount $ 0 500,000,000.0
Company issued Senior Notes [1] $ 0 499,000,000
2.20% Senior Notes due December 6, 2019 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 2.20%  
Debt instrument face amount $ 300,000,000 0
Company issued Senior Notes [1] $ 298,600,000 0
2.50% Senior Notes due March 15, 2020 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 2.50%  
Debt instrument face amount $ 500,000,000 500,000,000.0
Company issued Senior Notes [1] $ 497,800,000 $ 496,600,000
3.50% Senior Notes due October 15, 2021 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.50% 3.50%
Debt instrument face amount $ 750,000,000 $ 750,000,000.0
Company issued Senior Notes [1] $ 775,600,000 782,600,000
3.00% Senior Notes due March 15, 2022 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.00%  
Debt instrument face amount $ 400,000,000 400,000,000.0
Company issued Senior Notes [1] $ 397,300,000 396,600,000
3.50% Senior Notes due March 15, 2025 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.50%  
Debt instrument face amount $ 1,000,000,000 1,000,000,000.0
Company issued Senior Notes [1] $ 994,400,000 993,600,000
3.38% Senior Notes due December 15, 2027 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.38%  
Debt instrument face amount $ 500,000,000 0
Company issued Senior Notes [1] $ 495,800,000 0
4.25% Senior Notes due March 15, 2035 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 4.25%  
Debt instrument face amount $ 650,000,000 650,000,000.0
Company issued Senior Notes [1] $ 643,100,000 642,600,000
4.38% Senior Notes due March 15, 2045 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 4.38%  
Debt instrument face amount $ 600,000,000 600,000,000.0
Company issued Senior Notes [1] 585,400,000 584,900,000
Term Loan Credit Agreement due March 23, 2020 [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount 0 550,000,000.0
Term loan credit agreement carrying value [1] 0 548,600,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit $ 0 $ 0
[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of terminated interest rate contracts, offering discounts, and capitalized debt issuance costs.