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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Oct. 27, 2019 | Oct. 28, 2018
Cash flows from operating activities: |  |
Net income | $ 1,845 | $ 3,575
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 624 | 400
Depreciation and amortization | 275 | 184
Deferred income taxes | (5) | 30
Other | 5 | (35)
Changes in operating assets and liabilities: |  |
Accounts receivable | (32) | (943)
Inventories | 531 | (620)
Prepaid expenses and other assets | 55 | (68)
Accounts payable | 91 | 224
Accrued and other current liabilities | (103) | 147
Other long-term liabilities | 10 | (49)
Net cash provided by operating activities | 3,296 | 2,845
Cash flows from investing activities: |  |
Proceeds from maturities of marketable securities | 4,744 | 6,267
Proceeds from sales of marketable securities | 3,363 | 114
Purchases of marketable securities | (1,461) | (10,112)
Purchases of property and equipment and intangible assets | (344) | (397)
Investment in non-affiliates | (6) | (9)
Net cash provided by (used in) investing activities | 6,296 | (4,137)
Cash flows from financing activities: |  |
Proceeds related to employee stock plans | 146 | 135
Payments related to tax on restricted stock units | (463) | (982)
Dividends paid | (292) | (273)
Payments related to repurchases of common stock | 0 | (855)
Repayment of Convertible Notes | 0 | (12)
Other | 0 | (2)
Net cash used in financing activities | (609) | (1,989)
Change in cash and cash equivalents | 8,983 | (3,281)
Cash and cash equivalents at beginning of period | 782 | 4,002
Cash and cash equivalents at end of period | 9,765 | 721
Other non-cash investing activity: |  |
Assets acquired by assuming related liabilities | $ 87 | $ 98

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration