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Debt and Credit Facilities (Tables)
12 Months Ended
Apr. 30, 2021
Debt Disclosure [Abstract]  
Schedule of long-term debt
Our long-term debt (net of unamortized discounts and issuance costs) consisted of:
April 30,20202021
2.25% senior notes, $250 principal amount, due January 15, 2023
$249 $249 
3.50% senior notes, $300 principal amount, due April 15, 2025
297 298 
1.20% senior notes, €300 principal amount, due July 7, 2026
324 362 
2.60% senior notes, £300 principal amount, due July 7, 2028
369 415 
4.00% senior notes, $300 principal amount, due April 15, 2038
294 294 
3.75% senior notes, $250 principal amount, due January 15, 2043
248 248 
4.50% senior notes, $500 principal amount, due July 15, 2045
488 488 
$2,269 $2,354 
Schedule of short-term debt
April 30,20202021
Commercial paper$333$195
Average interest rate1.29%0.16%
Average remaining days to maturity7324