CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Oct. 25, 2015	Oct. 26, 2014
Cash flows from operating activities:
Net income	$ 406	$ 437
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	151	166
Stock-based compensation expense	145	115
Restructuring and other charges	37	0
Amortization of debt discount	22	21
Net gain on sale and disposal of long-lived assets and investments	(7)	(18)
Deferred income taxes	107	62
Tax benefits from stock-based compensation	(5)	(12)
Other	16	19
Changes in operating assets and liabilities:
Accounts receivable	(63)	(138)
Inventories	59	(20)
Prepaid expenses and other assets	(25)	5
Accounts payable	7	10
Accrued and other current liabilities	(41)	(23)
Other long-term liabilities	(145)	(161)
Net cash provided by operating activities	664	463
Cash flows from investing activities:
Purchases of marketable securities	(2,669)	(2,126)
Proceeds from sale of marketable securities	1,651	1,100
Proceeds from maturities of marketable securities	872	688
Proceeds from sale of long-lived assets and investments	7	21
Reimbursement of headquarters building development costs from banks	24	0
Purchases of property and equipment and intangible assets	(71)	(91)
Other	(1)	(1)
Net cash used in investing activities	(187)	(409)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	99	129
Payments under capital lease obligations	(3)	(2)
Tax benefits from stock-based compensation	5	12
Payments for repurchase of common stock	(452)	(810)
Dividends paid	(152)	(140)
Net cash used in financing activities	(503)	(811)
Change in cash and cash equivalents	(26)	(757)
Cash and cash equivalents at beginning of period	497	1,152
Cash and cash equivalents at end of period	471	395
Other non-cash activity:
Assets acquired by assuming related liabilities	$ 0	$ 14