CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Cash flows from operating activities:
Net income	$ 614	$ 631	$ 440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	197	220	239
Stock-based compensation expense	204	158	136
Restructuring and other charges	45	0	0
Amortization of debt discount	29	28	5
Net gain on sale and disposal of long-lived assets and investments	(6)	(17)	(8)
Deferred income taxes	134	83	15
Tax benefit from stock-based compensation	(10)	(18)	(26)
Other	19	24	21
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(32)	(49)	29
Inventories	66	(95)	25
Prepaid expenses and other assets	(16)	4	12
Accounts payable	(11)	(27)	(20)
Accrued and other current liabilities	39	5	5
Other long-term liabilities	97	41	38
Net cash provided by operating activities	1,175	906	835
Cash flows from investing activities:
Purchases of marketable securities	(3,477)	(2,862)	(3,066)
Proceeds from sales of marketable securities	2,102	1,372	1,927
Proceeds from maturities of marketable securities	1,036	865	585
Purchases of property and equipment and intangible assets	(86)	(122)	(255)
Proceeds from sale of long-lived assets and investments	7	21	25
Acquisition of businesses, net of cash and cash equivalents	0	0	(17)
Reimbursement of headquarters building development costs from banks	24	0	0
Other	(6)	(1)	(5)
Net cash used in investing activities	(400)	(727)	(806)
Cash flows from financing activities:
Proceeds from issuance of convertible notes, net	0	0	1,478
Purchase of convertible note hedges	0	0	(167)
Proceeds from the sale of common stock warrants	0	0	59
Proceeds from issuance of common stock under employee stock plans	120	154	69
Payments related to repurchases of common stock	(587)	(814)	(887)
Dividends paid	(213)	(186)	(181)
Tax benefit from stock-based compensation	10	18	26
Payments under capital lease obligations	(3)	(3)	(2)
Other	(3)	(3)	(5)
Net cash (used in) provided by financing activities	(676)	(834)	390
Change in cash and cash equivalents	99	(655)	419
Cash and cash equivalents at beginning of period	497	1,152	733
Cash and cash equivalents at end of period	596	497	1,152
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	14	14	15
Cash paid for interest	17	17	3
Non-cash investing and financing activities:
Assets acquired by assuming related liabilities	19	10	3
Goodwill adjustment related to previously acquired business	$ 0	$ (25)	$ 0