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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 26, 2020 | Apr. 28, 2019
Cash flows from operating activities: |  |
Net income | $ 917 | $ 394
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 224 | 178
Depreciation and amortization | 107 | 91
Deferred income taxes | 16 | (42)
Other | 4 | (2)
Changes in operating assets and liabilities: |  |
Accounts receivable | (249) | 182
Inventories | (151) | 153
Prepaid expenses and other assets | (8) | 5
Accounts payable | 71 | (123)
Accrued and other current liabilities | (32) | (129)
Other long-term liabilities | 10 | 13
Net cash provided by operating activities | 909 | 720
Cash flows from investing activities: |  |
Proceeds from sales of marketable securities | 1 | 26
Proceeds from maturities of marketable securities | 0 | 2,219
Purchases of marketable securities | (861) | (622)
Purchases of property and equipment and intangible assets | (155) | (128)
Acquisition of business, net of cash acquired | (34) | 0
Investments and other, net | (6) | 0
Net cash provided by (used in) investing activities | (1,055) | 1,495
Cash flows from financing activities: |  |
Issuance of debt, net of issuance costs | 4,979 | 0
Proceeds related to employee stock plans | 88 | 83
Payments related to tax on restricted stock units | (222) | (211)
Dividends paid | (98) | (97)
Other | (3) | 0
Net cash provided by (used in) financing activities | 4,744 | (225)
Change in cash and cash equivalents | 4,598 | 1,990
Cash and cash equivalents at beginning of period | 10,896 | 782
Cash and cash equivalents at end of period | 15,494 | 2,772
Other non-cash investing activity: |  |
Assets acquired by assuming related liabilities | $ 230 | $ 114

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration