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Debt (Carrying Value of Senior Notes) (Details) - USD ($) $ in Millions	Jul. 31, 2020	Apr. 07, 2020	Jan. 31, 2020
Debt Instrument [Line Items]
Net carrying amount	$ 4,714		$ 2,731
Senior Notes
Debt Instrument [Line Items]
Long-term debt	4,750		4,000
Less: unamortized discount	(7)	$ (3)	(5)
Less: unamortized debt issuance costs	(29)		(16)
Net carrying amount	4,714		3,979
Current portion of long-term debt	0		1,248
Long-term debt	4,714		2,731
Senior Notes \| 2.30% Senior Note Due August 21, 2020
Debt Instrument [Line Items]
Long-term debt	$ 0		1,250
Effective Interest Rate	2.56%
Interest rate	2.30%
Senior Notes \| 2.95% Senior Note Due August 21, 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,500		1,500
Effective Interest Rate	3.17%
Interest rate	2.95%
Senior Notes \| 3.90% Senior Note Due August 21, 2027
Debt Instrument [Line Items]
Long-term debt	$ 1,250		1,250
Effective Interest Rate	4.05%
Interest rate	3.90%
Senior Notes \| 4.50% Senior Note Due May 15, 2025
Debt Instrument [Line Items]
Long-term debt	$ 750		0
Effective Interest Rate	4.70%
Interest rate	4.50%
Senior Notes \| 4.65% Senior Note Due May 15, 2027
Debt Instrument [Line Items]
Long-term debt	$ 500		0
Effective Interest Rate	4.80%
Interest rate	4.65%
Senior Notes \| 4.70% Senior Note Due May 15, 2030
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 0
Effective Interest Rate	4.86%
Interest rate	4.70%