CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Cash flows from operating activities:
Net income	$ 4,141	$ 3,047	$ 1,666
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	557	391	247
Depreciation and amortization	262	199	187
Deferred income taxes	(315)	(359)	197
Loss on early debt conversions	0	19	21
Other	(45)	20	33
Changes in operating assets and liabilities:
Accounts receivable	(149)	(440)	(321)
Inventories	(776)	0	(375)
Prepaid expenses and other assets	(55)	21	(18)
Accounts payable	(135)	90	184
Accrued and other current liabilities	256	33	(135)
Other long-term liabilities	2	481	(14)
Net cash provided by operating activities	3,743	3,502	1,672
Cash flows from investing activities:
Proceeds from maturities of marketable securities	7,232	1,078	969
Proceeds from sales of marketable securities	428	863	1,546
Purchases of marketable securities	(11,148)	(36)	(3,134)
Purchases of property and equipment and intangible assets	(600)	(593)	(176)
Investment in non-affiliates	(9)	(36)	(5)
Proceeds from sale of long-lived assets and investments	0	2	7
Net cash provided by (used in) investing activities	(4,097)	1,278	(793)
Cash flows from financing activities:
Proceeds from issuance of debt	0	0	1,988
Payments related to repurchases of common stock	(1,579)	(909)	(739)
Repayment of Convertible Notes	(16)	(812)	(673)
Dividends paid	(371)	(341)	(261)
Proceeds related to employee stock plans	137	139	167
Payments related to tax on restricted stock units	(1,032)	(612)	(176)
Other	(5)	(9)	(15)
Net cash provided by (used in) financing activities	(2,866)	(2,544)	291
Change in cash and cash equivalents	(3,220)	2,236	1,170
Cash and cash equivalents at beginning of period	4,002	1,766	596
Cash and cash equivalents at end of period	782	4,002	1,766
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	61	22	14
Cash paid for interest	55	55	13
Non-cash investing and financing activity:
Assets acquired by assuming related liabilities	$ 76	$ 36	$ 16

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