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Debt and Financing Arrangements (Details) - USD ($)
Jul. 31, 2019
Apr. 30, 2019
May 14, 2018
Long-term debt      
Debt instrument face amount $ 5,500,000,000.0 $ 5,500,000,000.0  
Total long-term debt [1] 5,484,300,000 5,484,800,000  
Current portion of long-term debt [1] 799,000,000.0 798,500,000  
Long-term debt, less current portion [1] $ 4,685,300,000 $ 4,686,300,000  
2.20% Senior Notes due December 6, 2019      
Long-term debt      
Interest rate on notes 2.20% 2.20%  
Debt instrument face amount $ 300,000,000.0 $ 300,000,000.0  
Senior Notes [1] $ 299,700,000 $ 299,500,000  
2.50% Senior Notes due March 15, 2020      
Long-term debt      
Interest rate on notes 2.50% 2.50%  
Debt instrument face amount $ 500,000,000.0 $ 500,000,000.0  
Senior Notes [1] $ 499,300,000 $ 499,000,000.0  
3.50% Senior Notes due October 15, 2021      
Long-term debt      
Interest rate on notes 3.50% 3.50%  
Debt instrument face amount $ 750,000,000.0 $ 750,000,000.0  
Senior Notes [1] $ 766,600,000 $ 768,400,000  
3.00% Senior Notes due March 15, 2022      
Long-term debt      
Interest rate on notes 3.00% 3.00%  
Debt instrument face amount $ 400,000,000.0 $ 400,000,000.0  
Senior Notes [1] $ 398,200,000 $ 398,000,000.0  
3.50% Senior Notes due March 15, 2025      
Long-term debt      
Interest rate on notes 3.50% 3.50%  
Debt instrument face amount $ 1,000,000,000.0 $ 1,000,000,000.0  
Senior Notes [1] $ 995,400,000 $ 995,200,000  
3.38% Senior Notes due December 15, 2027      
Long-term debt      
Interest rate on notes 3.38% 3.38%  
Debt instrument face amount $ 500,000,000.0 $ 500,000,000.0  
Senior Notes [1] $ 496,300,000 $ 496,200,000  
4.25% Senior Notes due March 15, 2035      
Long-term debt      
Interest rate on notes 4.25% 4.25%  
Debt instrument face amount $ 650,000,000.0 $ 650,000,000.0  
Senior Notes [1] $ 643,600,000 $ 643,500,000  
4.38% Senior Notes due March 15, 2045      
Long-term debt      
Interest rate on notes 4.38% 4.38%  
Debt instrument face amount $ 600,000,000.0 $ 600,000,000.0  
Senior Notes [1] 586,100,000 586,000,000.0  
Term Loan Credit Agreement due May 14, 2021      
Long-term debt      
Debt instrument face amount 800,000,000.0 800,000,000.0 $ 1,500,000,000
Term loan credit agreement carrying value [1] 799,100,000 799,000,000.0  
Current portion of long term debt      
Long-term debt      
Debt instrument face amount 800,000,000.0 800,000,000.0  
Total long term debt, less current portion      
Long-term debt      
Debt instrument face amount $ 4,700,000,000.0 $ 4,700,000,000.0  
[1] Represents the carrying amount included in the Condensed Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, terminated interest rate contracts, and offering discounts