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v3.10.0.1

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Operating Activities: |  |
Net income | $ 5,457 | $ 8,480
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation expense | 169 | 155
Amortization expense | 902 | 734
Stock-based compensation expense | 670 | 304
Deferred income taxes | 10 | 127
Other | 14 | 227
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 367 | 473
Inventories | (191) | (79)
Prepaid expenses and other | 749 | 311
Accounts payable | (217) | (515)
Income taxes payable | (1,551) | (48)
Accrued liabilities | (324) | (1,024)
Net cash provided by operating activities | 6,055 | 9,145
Investing Activities: |  |
Purchases of marketable securities | (5,786) | (18,813)
Proceeds from sales of marketable securities | 1,201 | 8,966
Proceeds from maturities of marketable securities | 17,021 | 4,164
Capital expenditures | (676) | (370)
Other | (140) | 0
Net cash provided by (used in) investing activities | 11,620 | (6,053)
Financing Activities: |  |
Proceeds from issuances of common stock | 239 | 183
Proceeds from debt financing, net of issuance costs | 0 | 2,991
Repurchases of common stock | (1,938) | (848)
Repayments of debt and other obligations | (6,250) | (90)
Payments of dividends | (2,235) | (2,049)
Other | (464) | (141)
Net cash provided by (used in) financing activities | (10,648) | 46
Effect of exchange rate changes on cash and cash equivalents | (46) | 141
Net change in cash and cash equivalents | 6,981 | 3,279
Cash and cash equivalents at beginning of period | 7,588 | 8,229
Cash and cash equivalents at end of period | $ 14,569 | $ 11,508

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