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Debt and Credit Facilities (Tables)
12 Months Ended
Apr. 30, 2019
Debt Disclosure [Abstract]  
Schedule of long-term debt
Our long-term debt (net of unamortized discounts and issuance costs) consisted of:
April 30,
2018
 
2019
2.25% senior notes, $250 principal amount, due January 15, 2023
$
248

 
$
249

3.50% senior notes, $300 principal amount, due April 15, 2025
296

 
297

1.20% senior notes, €300 principal amount, due July 7, 2026
361

 
333

2.60% senior notes, £300 principal amount, due July 7, 2028
408

 
383

4.00% senior notes, $300 principal amount, due April 15, 2038
293

 
293

3.75% senior notes, $250 principal amount, due January 15, 2043
248

 
248

4.50% senior notes, $500 principal amount, due July 15, 2045
487

 
487

 
$
2,341

 
$
2,290