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Debt
 9 Months Ended
Jan. 31, 2020
Debt Disclosure [Abstract]  
Debt Debt
Our long-term debt (net of unamortized discount and issuance costs) consists of:
(Principal and carrying amounts in millions)
April 30,
2019
 
January 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
333

 
329

2.60% senior notes, £300 principal amount, due July 7, 2028
383

 
389

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

 
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
487

 
487

 
$
2,290

 
$
2,293


Our short-term borrowing included commercial paper of $150 million as of April 30, 2019, and $1 million as of January 31, 2020.
(Dollars in millions)
April 30,
2019
 
January 31,
2020
Commercial paper
$150
 
$1
Average interest rate
2.60%
 
1.63%
Average remaining days to maturity
18
 
3