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Debt (Tables)
3 Months Ended
Jul. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Our long-term debt (net of unamortized discount and issuance costs) consists of:
(Principal and carrying amounts in millions)
April 30,
2020
 
July 31,
2020
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

 
297

1.20% senior notes, €300 principal amount, due July 7, 2026
324

 
352

2.60% senior notes, £300 principal amount, due July 7, 2028
369

 
388

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

 
$
2,316


Schedule of Short-term Debt [Table Text Block]
(Dollars in millions)
April 30,
2020
 
July 31,
2020
Commercial paper
$333
 
$377
Average interest rate
1.29%
 
0.54%
Average remaining days to maturity
73
 
66