CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jul. 26, 2015	Jul. 27, 2014
Cash flows from operating activities:
Net income	$ 160	$ 265
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	103	111
Stock-based compensation expense	93	74
Restructuring and other charges	32	0
Amortization of debt discount	14	14
Net gain on sale and disposal of long-lived assets and investments	(3)	(14)
Deferred income taxes	65	38
Tax benefits from stock-based compensation	(6)	(7)
Other	11	14
Changes in operating assets and liabilities:
Accounts receivable	(41)	(46)
Inventories	42	1
Prepaid expenses and other assets	(13)	3
Accounts payable	(13)	(64)
Accrued and other current liabilities	60	(12)
Other long-term liabilities	(95)	(130)
Net cash provided by operating activities	409	247
Cash flows from investing activities:
Purchases of marketable securities	(1,861)	(1,683)
Proceeds from sale of marketable securities	1,415	869
Proceeds from maturities of marketable securities	487	451
Proceeds from sale of long-lived assets and investments	2	21
Reimbursement of headquarters building development costs from banks	24	0
Purchases of property and equipment and intangible assets	(54)	(52)
Other	(1)	0
Net cash provided by (used in) investing activities	12	(394)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	64	98
Payments under capital lease obligations	(2)	(1)
Tax benefits from stock-based compensation	6	7
Payments for repurchase of common stock	(452)	(500)
Dividends paid	(99)	(94)
Net cash used in financing activities	(483)	(490)
Change in cash and cash equivalents	(62)	(637)
Cash and cash equivalents at beginning of period	497	1,152
Cash and cash equivalents at end of period	435	515
Other non-cash activity:
Assets acquired by assuming related liabilities	$ 2	$ 6