Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net income	$ 3,358	$ 5,768
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	112	103
Amortization expense	601	489
Stock-based compensation expense	472	191
Deferred income taxes	(2)	138
Other	149	189
Changes in operating assets and liabilities:
Accounts receivable, net	277	118
Inventories	(34)	(14)
Prepaid expenses and other	622	145
Accounts payable	(193)	(399)
Income taxes payable	(1,838)	72
Accrued liabilities	319	(349)
Net cash provided by operating activities	3,843	6,451
Investing Activities:
Purchases of marketable securities	(2,009)	(13,269)
Proceeds from sales of marketable securities	676	7,629
Proceeds from maturities of marketable securities	11,539	1,942
Capital expenditures	(509)	(241)
Other	(102)	0
Net cash provided by (used in) investing activities	9,595	(3,939)
Financing Activities:
Proceeds from issuances of common stock	159	119
Repurchases of common stock	(1,489)	(695)
Repayments of debt and other obligations	(4,500)	(60)
Payments of dividends	(1,493)	(1,367)
Other	(424)	(121)
Net cash used in financing activities	(7,747)	(2,124)
Effect of exchange rate changes on cash and cash equivalents	(45)	95
Net change in cash and cash equivalents	5,646	483
Cash and cash equivalents at beginning of period	7,588	8,229
Cash and cash equivalents at end of period	$ 13,234	$ 8,712