Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Operating activities:
Net income		$ 91	$ 299	$ 483	$ 643
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		457	253	894	450
Amortization of costs capitalized to obtain revenue contracts, net		217	183	426	371
Expenses related to employee stock plans		388	351	731	603
Loss on settlement of Salesforce.org reseller agreement (Note 6)	[1],[2]	166	0	166	0
Gains on strategic investments, net		(109)	(143)	(390)	(354)
Changes in assets and liabilities, net of business combinations:
Accounts receivable, net		(146)	(149)	2,628	2,013
Costs capitalized to obtain revenue contracts, net		(173)	(146)	(297)	(264)
Prepaid expenses and other current assets and other assets		28	4	(69)	(86)
Accounts payable		26	71	41	121
Accrued expenses and other liabilities		267	108	(293)	(398)
Operating lease liabilities		(182)	0	(346)	0
Unearned revenue		(594)	(373)	(1,573)	(1,175)
Net cash provided by operating activities		436	458	2,401	1,924
Investing activities:
Business combinations, net of cash acquired		(423)	(4,803)	(433)	(4,985)
Purchases of strategic investments		(62)	(37)	(221)	(184)
Sales of strategic investments		71	2	265	6
Purchases of marketable securities		(772)	(28)	(1,506)	(291)
Sales of marketable securities		375	335	461	1,273
Maturities of marketable securities		137	40	193	88
Capital expenditures		(178)	(170)	(337)	(292)
Net cash used in investing activities		(852)	(4,661)	(1,578)	(4,385)
Financing activities:
Proceeds from issuance of debt, net		0	496	0	2,966
Proceeds from employee stock plans		152	182	371	383
Principal payments on financing obligations	[3]	(134)	(89)	(145)	(108)
Repayments of debt		(201)	0	(202)	(1,027)
Net cash provided by (used in) financing activities		(183)	589	24	2,214
Effect of exchange rate changes		(1)	11	(6)	23
Net increase (decrease) in cash and cash equivalents		(600)	(3,603)	841	(224)
Cash and cash equivalents, beginning of period		4,110	5,922	2,669	2,543
Cash and cash equivalents, end of period		3,510	2,319	3,510	2,319
Cash paid during the period for:
Interest		6	22	56	29
Income taxes, net of tax refunds		37	18	55	37
Non-cash investing and financing activities:
Fair value of equity awards assumed		0	387	0	387
Fair value of common stock issued as consideration for business combinations		$ 0	$ 1,178	$ 0	$ 1,178

[1] Amounts include amortization of intangible assets acquired through business combinations, as follows:   Three Months Ended July 31,   Six Months Ended July 31,   2019   2018   2019   2018 Cost of revenues $ 62
  $ 52
  $ 123
  $ 91
Marketing and sales 65
  67
  133
  97

[2] Amounts include stock-based expense, as follows:   Three Months Ended July 31,   Six Months Ended July 31,   2019   2018   2019   2018 Cost of revenues $ 46
  $ 43
  $ 89
  $ 77
Research and development 98
  81
  179
  147
Marketing and sales 199
  174
  376
  294
General and administrative 45
  53
  87
  85

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