Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Operating activities:
Net income	$ 468	$ 1,081	$ 1,472	$ 3,805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	963	670	2,367	1,977
Amortization of costs capitalized to obtain revenue contracts, net	344	271	992	768
Stock-based expense	812	566	2,016	1,648
Gains on strategic investments, net	(363)	(1,036)	(1,177)	(1,910)
Tax benefit from intra-entity transfer of intangible property	0	0	0	(2,003)
Changes in assets and liabilities, net of business combinations:
Accounts receivable, net	91	128	3,895	2,873
Costs capitalized to obtain revenue contracts, net	(405)	(493)	(1,223)	(973)
Prepaid expenses and other current assets and other assets	189	80	(1)	(134)
Accounts payable and accrued expenses and other liabilities	(548)	68	(836)	4
Operating lease liabilities	(191)	(204)	(607)	(616)
Unearned revenue	(956)	(792)	(2,880)	(2,812)
Net cash provided by operating activities	404	339	4,018	2,627
Investing activities:
Business combinations, net of cash acquired	(35)	(24)	(14,816)	(1,281)
Purchases of strategic investments	(147)	(368)	(933)	(942)
Sales of strategic investments	695	33	2,164	685
Purchases of marketable securities	(2,193)	(1,453)	(4,509)	(3,968)
Sales of marketable securities	720	662	3,765	1,206
Maturities of marketable securities	150	239	1,802	796
Capital expenditures	(166)	(124)	(550)	(561)
Net cash used in investing activities	(976)	(1,035)	(13,077)	(4,065)
Financing activities:
Proceeds from issuance of debt, net of issuance costs	(6)	0	7,906	0
Repayments of Slack Convertible Notes, net of capped call proceeds (Note 8)	(1,348)	0	(1,180)	0
Proceeds from employee stock plans	430	381	1,030	1,105
Principal payments on financing obligations	(45)	(12)	(118)	(84)
Repayments of debt	(1)	(1)	(3)	(3)
Net cash provided by (used in) financing activities	(970)	368	7,635	1,018
Effect of exchange rate changes	(4)	0	(18)	(1)
Net decrease in cash and cash equivalents	(1,546)	(328)	(1,442)	(421)
Cash and cash equivalents, beginning of period	6,299	4,052	6,195	4,145
Cash and cash equivalents, end of period	4,753	3,724	4,753	3,724
Cash paid during the period for:
Interest	46	46	94	94
Income taxes, net of tax refunds	68	56	151	180
Non-cash investing and financing activities:
Fair value of equity awards assumed	0	0	205	6
Fair value of common stock issued as consideration for the acquisition of Slack	$ 0	$ 0	$ 11,064	$ 0