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Debt (Tables)
3 Months Ended
Jul. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Our long-term debt (net of unamortized discount and issuance costs) consists of:
(Principal and carrying amounts in millions)
April 30,
2018
 
July 31,
2018
2.25% senior notes, $250 principal amount, due January 15, 2023
$
248

 
$
248

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

 
296

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

 
349

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

 
389

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

 
$
2,310