CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Oct. 29, 2017	Oct. 30, 2016
Cash flows from operating activities:
Net income	$ 1,928	$ 1,012
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	145	140
Stock-based compensation expense	265	176
Deferred income taxes	158	146
Amortization of debt discount	3	20
Loss on early debt conversions	19	15
Net loss (gain) on sale and disposal of long-lived assets and investments	1	(2)
Other	11	8
Changes in operating assets and liabilities:
Accounts receivable	(342)	(328)
Inventories	(61)	(261)
Prepaid expenses and other assets	(26)	(28)
Accounts payable	27	218
Accrued and other current liabilities	(15)	(136)
Other long-term liabilities	31	(29)
Net cash provided by operating activities	2,144	951
Cash flows from investing activities:
Proceeds from sales of marketable securities	802	1,239
Proceeds from maturities of marketable securities	739	712
Proceeds from sale of long-lived assets and investments	0	6
Purchases of marketable securities	(36)	(2,249)
Purchases of property and equipment and intangible assets	(177)	(125)
Investment in non-affiliates	(26)	(3)
Net cash provided by (used in) investing activities	1,302	(420)
Cash flows from financing activities:
Proceeds from issuance of debt	0	1,988
Payments related to repurchases of common stock	(909)	(509)
Repayment of Convertible Notes	(803)	(444)
Dividends paid	(250)	(185)
Proceeds related to employee stock plans	132	148
Payments related to tax on restricted stock units	(577)	(177)
Other	(3)	(8)
Net cash provided by (used in) financing activities	(2,410)	813
Change in cash and cash equivalents	1,036	1,344
Cash and cash equivalents at beginning of period	1,766	596
Cash and cash equivalents at end of period	2,802	1,940
Other non-cash activity:
Assets acquired by assuming related liabilities	$ 20	$ 25