CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Cash flows from operating activities:
Net income	$ 1,666	$ 614	$ 631
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	187	197	220
Stock-based compensation expense	247	204	158
Restructuring and other charges	0	45	0
Amortization of debt discount	25	29	28
Net gain on sale and disposal of long-lived assets and investments	(3)	(6)	(17)
Loss on early debt conversions	21	0	0
Deferred income taxes	197	134	83
Tax benefit from stock-based compensation	0	(10)	(18)
Other	11	19	24
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(321)	(32)	(49)
Inventories	(375)	66	(95)
Prepaid expenses and other assets	(18)	(16)	4
Accounts payable	184	(11)	(27)
Accrued and other current liabilities	(135)	39	5
Other long-term liabilities	(14)	(97)	(41)
Net cash provided by operating activities	1,672	1,175	906
Cash flows from investing activities:
Proceeds from sales of marketable securities	1,546	2,102	1,372
Proceeds from maturities of marketable securities	969	1,036	865
Proceeds from sale of long-lived assets and investments	7	7	21
Purchases of marketable securities	(3,134)	(3,477)	(2,862)
Purchases of property and equipment and intangible assets	(176)	(86)	(122)
Reimbursement of headquarters building development costs from banks	0	24	0
Other	(5)	(6)	(1)
Net cash used in investing activities	(793)	(400)	(727)
Cash flows from financing activities:
Proceeds from issuance of convertible notes, net	1,988	0	0
Payments for Repurchase of Common Stock	(739)	(587)	(814)
Repayments of Convertible Debt	(673)	0	0
Dividends paid	(261)	(213)	(186)
Net proceeds (payments) related to employee stock plans	(9)	120	154
Payments of Debt Issuance Costs	(8)	0	0
Tax benefit from stock-based compensation	0	10	18
Other	(7)	(6)	(6)
Net cash (used in) provided by financing activities	291	(676)	(834)
Change in cash and cash equivalents	1,170	99	(655)
Cash and cash equivalents at beginning of period	596	497	1,152
Cash and cash equivalents at end of period	1,766	596	497
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	14	14	14
Cash paid for interest	13	17	17
Non-cash investing and financing activities:
Assets acquired by assuming related liabilities	16	19	10
Goodwill adjustment related to previously acquired business	$ 0	$ 0	$ (25)