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Borrowings - Senior Notes (Details) - Unsecured debt - USD ($)
 12 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Schedule of Debt [Line Items]    
Percentage of outstanding principal amount as redemption price 100.00%  
Senior notes    
Schedule of Debt [Line Items]    
Unsecured debt $ 10,285,300,000 $ 10,682,300,000
4.75% Senior Notes Due December 2025    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.75%  
Principal $ 400,000,000.0  
Unsecured debt $ 0 399,500,000
3.70% Senior Notes Due December 2026    
Schedule of Debt [Line Items]    
Coupon rate of notes 3.70%  
Principal $ 600,000,000.0  
Unsecured debt $ 599,500,000 598,900,000
Basis points above adjusted treasury rate 0.25%  
3.50% Senior Notes Due May 2027    
Schedule of Debt [Line Items]    
Coupon rate of notes 3.50%  
Principal $ 500,000,000.0  
Unsecured debt $ 499,300,000 498,800,000
Basis points above adjusted treasury rate 0.20%  
4.50% Senior Notes Due May 2047    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.50%  
Principal $ 500,000,000.0  
Unsecured debt $ 494,400,000 494,200,000
Basis points above adjusted treasury rate 0.25%  
3.60% Senior Notes Due February 2028    
Schedule of Debt [Line Items]    
Coupon rate of notes 3.60%  
Principal $ 700,000,000.0  
Unsecured debt $ 698,600,000 697,900,000
Basis points above adjusted treasury rate 0.15%  
4.10% Senior Notes Due February 2048    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.10%  
Principal $ 600,000,000.0  
Unsecured debt $ 593,700,000 593,400,000
Basis points above adjusted treasury rate 0.20%  
4.40% Senior Notes Due November 2025    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.40%  
Principal $ 500,000,000.0  
Unsecured debt $ 0 499,500,000
4.65% Senior Notes Due November 2028    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.65%  
Principal $ 500,000,000.0  
Unsecured debt $ 498,500,000 497,900,000
Basis points above adjusted treasury rate 0.25%  
5.25% Senior Notes Due November 2048    
Schedule of Debt [Line Items]    
Coupon rate of notes 5.25%  
Principal $ 500,000,000.0  
Unsecured debt $ 494,300,000 494,100,000
Basis points above adjusted treasury rate 0.30%  
3.15% Senior Notes Due August 2029    
Schedule of Debt [Line Items]    
Coupon rate of notes 3.15%  
Principal $ 800,000,000.0  
Unsecured debt $ 797,600,000 796,800,000
Basis points above adjusted treasury rate 0.20%  
2.875% Senior Notes Due May 2030    
Schedule of Debt [Line Items]    
Coupon rate of notes 2.875%  
Principal $ 600,000,000.0  
Unsecured debt $ 597,400,000 596,800,000
Basis points above adjusted treasury rate 0.35%  
3.75% Senior Notes Due May 2050    
Schedule of Debt [Line Items]    
Coupon rate of notes 3.75%  
Principal $ 600,000,000.0  
Unsecured debt $ 591,300,000 591,000,000.0
Basis points above adjusted treasury rate 0.40%  
2.25% Senior Notes Due August 2031    
Schedule of Debt [Line Items]    
Coupon rate of notes 2.25%  
Principal $ 1,000,000,000  
Unsecured debt $ 993,100,000 991,800,000
Basis points above adjusted treasury rate 0.15%  
4.35% May 2022 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.35%  
Principal $ 600,000,000.0  
Unsecured debt $ 599,200,000 598,400,000
Basis points above adjusted treasury rate 0.25%  
4.75% May 2022 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.75%  
Principal $ 700,000,000.0  
Unsecured debt $ 695,700,000 695,000,000.0
Basis points above adjusted treasury rate 0.30%  
5.00% Feb 2023 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 5.00%  
Principal $ 500,000,000.0  
Unsecured debt $ 0 499,000,000.0
4.90% May 2023 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.90%  
Principal $ 750,000,000.0  
Unsecured debt $ 742,700,000 741,600,000
Basis points above adjusted treasury rate 0.25%  
4.80% January 2024 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.80%  
Principal $ 400,000,000.0  
Unsecured debt $ 398,300,000 397,700,000
Basis points above adjusted treasury rate 0.15%  
4.80% May 2025 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.80%  
Principal $ 500,000,000.0  
Unsecured debt $ 496,500,000 0
Basis points above adjusted treasury rate 0.20%  
4.95% October 2025 Senior Notes    
Schedule of Debt [Line Items]    
Coupon rate of notes 4.95%  
Principal $ 500,000,000.0  
Unsecured debt $ 495,200,000 $ 0
Basis points above adjusted treasury rate 0.15%