Debt (Tables)

6 Months Ended

Jul. 31, 2020

Debt Disclosure [Abstract]

Carrying Value of Senior Notes

The carrying value of the Senior Notes as of the periods presented was as follows (amounts in millions):

	July 31,			January 31,			Effective Interest Rate
	2020			2020
Senior Notes issued August 21, 2017:
2.30% Senior Note Due August 21, 2020	$	—		$	1,250		2.56%
2.95% Senior Note Due August 21, 2022	1,500			1,500			3.17%
3.90% Senior Note Due August 21, 2027	1,250			1,250			4.05%
Senior Notes issued April 7, 2020:
4.50% Senior Note Due May 15, 2025	750			—			4.70%
4.65% Senior Note Due May 15, 2027	500			—			4.80%
4.70% Senior Note Due May 15, 2030	750			—			4.86%
Total principal amount	4,750			4,000
Less: unamortized discount	(7		)	(5		)
Less: unamortized debt issuance costs	(29		)	(16		)
Net carrying amount	4,714			3,979
Current portion of long-term debt	—			1,248
Long-term debt	$	4,714		$	2,731