Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Operating activities:
Net income (loss)		$ 126	$ 1,110		$ 360
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		2,135	982		784
Amortization of costs capitalized to obtain revenue contracts, net		876	737		592
Expenses related to employee stock plans		1,785	1,283		997
Loss on settlement of Salesforce.org reseller agreement (Note 7)		166	0	[1],[2]	0	[1],[2]
Gains on strategic investments, net		(427)	(542)		(19)
Changes in assets and liabilities, net of business combinations:
Accounts receivable, net		(1,000)	(923)		(719)
Costs capitalized to obtain revenue contracts, net		(1,130)	(981)		(1,156)
Prepaid expenses and other current assets and other assets		(119)	(58)		18
Accounts payable		15	74		(39)
Accrued expenses and other liabilities		967	213		392
Operating lease liabilities		(728)
Unearned revenue		1,665	1,503		1,528
Net cash provided by operating activities		4,331	3,398		2,738
Investing activities:
Business combinations, net of cash acquired		(369)	(5,115)		(25)
Purchases of strategic investments		(768)	(362)		(216)
Sales of strategic investments		434	260		131
Purchases of marketable securities		(3,857)	(1,068)		(2,003)
Sales of marketable securities		1,444	1,426		558
Maturities of marketable securities		779	146		78
Capital expenditures		(643)	(595)		(534)
Net cash used in investing activities		(2,980)	(5,308)		(2,011)
Financing activities:
Proceeds from issuance of debt, net		0	2,966		0
Proceeds from employee stock plans		840	704		650
Principal payments on financing obligations	[3]	(173)	(131)		(106)
Repayments of debt		(503)	(1,529)		(323)
Net cash provided by financing activities		164	2,010		221
Effect of exchange rate changes		(39)	26		(12)
Net increase in cash and cash equivalents		1,476	126		936
Cash and cash equivalents, beginning of period		2,669	2,543		1,607
Cash and cash equivalents, end of period		4,145	2,669		2,543
Cash paid during the period for:
Interest		106	94		40
Income taxes, net of tax refunds		129	83		53
Non-cash investing and financing activities:
Fair value of equity awards assumed		373	480		0
Fair value of common stock issued as consideration for business combinations		$ 15,215	$ 1,715		$ 12

[1] Amounts include amortization of intangible assets acquired through business combinations, as follows:  Fiscal Year Ended January 31, 202020192018Cost of revenues$440  $215  $166  Marketing and sales352  232  121  

[2] Amounts include stock-based expense, as follows:  Fiscal Year Ended January 31, 202020192018Cost of revenues$204  $161  $130  Research and development510  307  260  Marketing and sales852  643  469  General and administrative219  172  138  

[3] Previously referred to as principal payments on capital lease obligations.