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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities:    
Net income $ 1,539 $ 2,699
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 56 49
Amortization expense 301 245
Stock-based compensation expense 220 89
Deferred income taxes 35 58
Other 49 39
Changes in operating assets and liabilities:    
Accounts receivable, net 101 537
Inventories (14) (5)
Prepaid expenses and other 529 177
Accounts payable (92) (262)
Income taxes payable (618) (24)
Accrued liabilities 164 (677)
Net cash provided by operating activities 2,270 2,925
Investing Activities:    
Purchases of marketable securities (397) (3,482)
Proceeds from sales of marketable securities 221 3,173
Proceeds from maturities of marketable securities 4,762 734
Capital expenditures (212) (118)
Other (20) 0
Net cash provided by investing activities 4,354 307
Financing Activities:    
Proceeds from issuances of common stock 111 96
Repurchases of common stock (1,039) (565)
Repayments of debt and other obligations (4,500) (30)
Payments of dividends (753) (687)
Other (414) (58)
Net cash used in financing activities (6,595) (1,244)
Effect of exchange rate changes on cash and cash equivalents 26 68
Net change in cash and cash equivalents 55 2,056
Cash and cash equivalents at beginning of period 7,588 8,229
Cash and cash equivalents at end of period $ 7,643 $ 10,285