CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2016	Jul. 26, 2015
Cash flows from operating activities:
Net income	$ 449	$ 160
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	111	93
Depreciation and amortization	92	103
Deferred income taxes	74	65
Amortization of debt discount	14	14
Net gain on sale and disposal of long-lived assets and investments	(3)	(3)
Tax benefits from stock-based compensation	(26)	(6)
Restructuring and other charges	0	32
Other	7	11
Changes in operating assets and liabilities:
Accounts receivable	(138)	(41)
Inventories	(104)	42
Prepaid expenses and other assets	(17)	(13)
Accounts payable	131	(13)
Accrued and other current liabilities	(85)	60
Other long-term liabilities	(12)	(95)
Net cash provided by operating activities	493	409
Cash flows from investing activities:
Proceeds from sales of marketable securities	901	1,415
Proceeds from maturities of marketable securities	506	487
Proceeds from sale of long-lived assets and investments	6	2
Purchases of marketable securities	(1,415)	(1,861)
Purchases of property and equipment and intangible assets	(87)	(54)
Reimbursement of headquarters building development costs from banks		24
Other	(4)	(1)
Net cash provided by (used in) investing activities	(93)	12
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	40	64
Tax benefits from stock-based compensation	26	6
Payments related to repurchases of common stock	(509)	(452)
Dividends paid	(124)	(99)
Payments under capital lease obligations	(2)	(2)
Other	(1)	0
Net cash used in financing activities	(570)	(483)
Change in cash and cash equivalents	(170)	(62)
Cash and cash equivalents at beginning of period	596	497
Cash and cash equivalents at end of period	426	435
Other non-cash activity:
Assets acquired by assuming related liabilities	$ 15	$ 2