CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Apr. 29, 2018	Apr. 30, 2017
Cash flows from operating activities:
Net income	$ 1,244	$ 507
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	129	76
Depreciation and amortization	57	47
Deferred income taxes	51	22
Loss on early debt conversions	0	14
Other	(8)	7
Changes in operating assets and liabilities:
Accounts receivable	56	(150)
Inventories	(2)	(27)
Prepaid expenses and other assets	(38)	(2)
Accounts payable	22	(133)
Accrued and other current liabilities	(81)	(87)
Other long-term liabilities	15	8
Net cash provided by operating activities	1,445	282
Cash flows from investing activities:
Proceeds from maturities of marketable securities	239	200
Proceeds from sales of marketable securities	33	649
Purchases of marketable securities	(3,705)	(36)
Purchases of property and equipment and intangible assets	(118)	(54)
Investment in non-affiliates	0	(5)
Net cash provided by (used in) investing activities	(3,551)	754
Cash flows from financing activities:
Payments related to repurchases of common stock	(655)	0
Repayment of Convertible Notes	(2)	(605)
Dividends paid	(91)	(82)
Proceeds related to employee stock plans	66	65
Payments related to tax on restricted stock units	(449)	(190)
Other	0	(1)
Net cash used in financing activities	(1,131)	(813)
Change in cash and cash equivalents	(3,237)	223
Cash and cash equivalents at beginning of period	4,002	1,766
Cash and cash equivalents at end of period	765	1,989
Other non-cash activity:
Assets acquired by assuming related liabilities	$ 43	$ 14