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Debt and Financing Arrangements (Details) - USD ($)
Apr. 30, 2022
Apr. 30, 2021
Long-term debt    
Debt instrument face amount $ 4,350,000,000 $ 4,700,000,000
Total long-term debt [1] 4,310,600,000 4,669,700,000
Current portion of long-term debt [1] 0 1,152,900,000
Long-term debt, less current portion [1] $ 4,310,600,000 $ 3,516,800,000
3.50% Senior Notes due October 15, 2021    
Long-term debt    
Interest rate on notes 3.50% 3.50%
Debt instrument face amount $ 0 $ 750,000,000.0
Senior Notes [1] $ 0 $ 753,500,000
3.00% Senior Notes due March 15, 2022    
Long-term debt    
Interest rate on notes 3.00% 3.00%
Debt instrument face amount $ 0 $ 400,000,000.0
Senior Notes [1] $ 0 $ 399,400,000
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 $ 1,000,000,000
Senior Notes [1] $ 997,600,000 $ 996,800,000
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] $ 497,600,000 $ 497,100,000
2.38% Senior Notes due March 15, 2030    
Long-term debt    
Interest rate on notes 2.38% 2.38%
Debt instrument face amount $ 500,000,000.0 $ 500,000,000.0
Senior Notes [1] $ 496,200,000 $ 495,700,000
2.13% Senior Notes due March 15, 2032    
Long-term debt    
Interest rate on notes 2.13% 2.13%
Debt instrument face amount $ 500,000,000.0 $ 0
Senior Notes [1] $ 493,800,000 $ 0
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] $ 644,700,000 $ 644,300,000
2.75% Senior Notes due September 15, 2041    
Long-term debt    
Interest rate on notes 2.75% 2.75%
Debt instrument face amount $ 300,000,000.0 $ 0
Senior Notes [1] $ 297,100,000 $ 0
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] $ 587,600,000 $ 587,100,000
3.55% Senior Notes due March 15, 2050    
Long-term debt    
Interest rate on notes 3.55% 3.55%
Debt instrument face amount $ 300,000,000.0 $ 300,000,000.0
Senior Notes [1] 296,000,000.0 295,800,000
Current portion of long-term debt    
Long-term debt    
Debt instrument face amount 0 1,150,000,000
Total long-term debt, less current portion    
Long-term debt    
Debt instrument face amount $ 4,350,000,000 $ 3,550,000,000
[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, offering discounts, and terminated interest rate contracts.