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Debt and Financing Arrangements (Details) - USD ($)
Apr. 30, 2019
Apr. 30, 2018
Debt Instrument [Line Items]    
Debt instrument face amount $ 5,500,000,000 $ 4,700,000,000
Long-term debt [1] 5,484,800,000 4,688,000,000
Current portion of long-term debt [1] 798,500,000 0
Long-term debt, less current portion [1] 4,686,300,000 4,688,000,000
Current Portion Of Long Term Debt [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount 800,000,000 0
Total Long Term Debt Less Current Portion [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 4,700,000,000 4,700,000,000
2.20% Senior Notes due December 6, 2019 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 2.20%  
Debt instrument face amount $ 300,000,000 300,000,000
Company issued Senior Notes [1] $ 299,500,000 298,600,000
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
Company issued Senior Notes [1] $ 499,000,000 497,800,000
3.50% Senior Notes due October 15, 2021 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.50%  
Debt instrument face amount $ 750,000,000 750,000,000
Company issued Senior Notes [1] $ 768,400,000 775,600,000
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
Company issued Senior Notes [1] $ 398,000,000 397,300,000
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
Company issued Senior Notes [1] $ 995,200,000 994,400,000
3.38% Senior Notes due December 15, 2027 [Member]    
Debt Instrument [Line Items]    
Interest rate on notes 3.38%  
Debt instrument face amount $ 500,000,000 500,000,000
Company issued Senior Notes [1] $ 496,200,000 495,800,000
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
Company issued Senior Notes [1] $ 643,500,000 643,100,000
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
Company issued Senior Notes [1] 586,000,000 585,400,000
Term Loan Credit Agreement due May 14, 2021 [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount 800,000,000 0
Term loan credit agreement carrying value [1] $ 799,000,000 $ 0
[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, terminated interest rate contracts, and offering discounts.