Debt - Carrying Value of Borrowings (Details) - USD ($) $ in Millions	Jan. 31, 2022	Jan. 31, 2021
Debt Instrument [Line Items]
Outstanding Principal as of January 31, 2022	$ 10,686
Total carrying value of debt	10,596	$ 2,677
Less current portion of debt	(4)	(4)
Total noncurrent debt	$ 10,592	2,673
Senior Notes \| 2023 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	3.25%
Outstanding Principal as of January 31, 2022	$ 1,000
Total carrying value of debt	$ 998	996
Senior Notes \| 2024 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	0.625%
Outstanding Principal as of January 31, 2022	$ 1,000
Total carrying value of debt	$ 997	0
Senior Notes \| 2028 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	3.70%
Outstanding Principal as of January 31, 2022	$ 1,500
Total carrying value of debt	$ 1,492	1,491
Senior Notes \| 2028 Senior Sustainability Notes
Debt Instrument [Line Items]
Contractual Interest Rate	1.50%
Outstanding Principal as of January 31, 2022	$ 1,000
Total carrying value of debt	$ 990	0
Senior Notes \| 2031 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	1.95%
Outstanding Principal as of January 31, 2022	$ 1,500
Total carrying value of debt	$ 1,488	0
Senior Notes \| 2041 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	2.70%
Outstanding Principal as of January 31, 2022	$ 1,250
Total carrying value of debt	$ 1,234	0
Senior Notes \| 2051 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	2.90%
Outstanding Principal as of January 31, 2022	$ 2,000
Total carrying value of debt	$ 1,976	0
Senior Notes \| 2061 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	3.05%
Outstanding Principal as of January 31, 2022	$ 1,250
Total carrying value of debt	$ 1,235	0
Secured Debt \| Loan assumed on 50 Fremont
Debt Instrument [Line Items]
Contractual Interest Rate	3.75%
Outstanding Principal as of January 31, 2022	$ 186
Total carrying value of debt	$ 186	$ 190

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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