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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