CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Cash flows from operating activities:
Net income	$ 3,047	$ 1,666	$ 614
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	391	247	204
Depreciation and amortization	199	187	197
Loss on early debt conversions	19	21	0
Amortization of debt discount	3	25	29
Deferred income taxes	(359)	197	134
Net gain on sale and disposal of long-lived assets and investments	(1)	(3)	(6)
Restructuring and other charges	0	0	45
Tax benefit from stock-based compensation	0	0	(10)
Other	18	11	19
Changes in operating assets and liabilities:
Accounts receivable	(440)	(321)	(32)
Inventories	0	(375)	66
Prepaid expenses and other assets	21	(18)	(16)
Accounts payable	90	184	(11)
Accrued and other current liabilities	33	(135)	39
Other long-term liabilities	481	(14)	(97)
Net cash provided by operating activities	3,502	1,672	1,175
Cash flows from investing activities:
Proceeds from sales of marketable securities	863	1,546	2,102
Proceeds from maturities of marketable securities	1,078	969	1,036
Proceeds from sale of long-lived assets and investments	2	7	7
Purchases of marketable securities	(36)	(3,134)	(3,477)
Purchases of property and equipment and intangible assets	(593)	(176)	(86)
Reimbursement of building development costs from banks	0	0	24
Investment in non-affiliates	(36)	(5)	(6)
Net cash provided by (used in) investing activities	1,278	(793)	(400)
Cash flows from financing activities:
Proceeds from issuance of debt	0	1,988	0
Payments related to repurchases of common stock	(909)	(739)	(587)
Repayment of Convertible Notes	(812)	(673)	0
Dividends paid	(341)	(261)	(213)
Proceeds related to employee stock plans	139	167	186
Payments related to tax on restricted stock units	(612)	(176)	(66)
Payments for debt issuance costs	0	(8)	0
Tax benefit from stock-based compensation	0	0	10
Other	(9)	(7)	(6)
Net cash provided by (used in) financing activities	(2,544)	291	(676)
Change in cash and cash equivalents	2,236	1,170	99
Cash and cash equivalents at beginning of period	1,766	596	497
Cash and cash equivalents at end of period	4,002	1,766	596
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	22	14	14
Cash paid for interest	55	13	17
Non-cash investing and financing activity:
Assets acquired by assuming related liabilities	$ 36	$ 16	$ 19