Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net income	$ 3,843	$ 3,358
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	120	112
Amortization expense	587	601
Stock-based compensation expense	317	472
Deferred income taxes	28	(2)
Net unrealized (gains) losses from equity securities	(254)	19
Other	66	130
Changes in operating assets and liabilities:
Accounts receivable, net	(68)	277
Inventories	(12)	(34)
Prepaid expenses and other	(34)	622
Accounts payable	(166)	(193)
Income taxes payable	(274)	(1,838)
Accrued liabilities and other	(488)	319
Net cash provided by operating activities	3,665	3,843
Investing Activities:
Purchases of marketable debt securities	(17,022)	(2,009)
Proceeds from sales of marketable debt securities	1,564	676
Proceeds from maturities of marketable debt securities	10,029	11,539
Capital expenditures	(422)	(509)
Other	302	102
Net cash provided by (used in) investing activities	(6,153)	9,595
Financing Activities:
Proceeds from issuances of common stock	141	159
Repurchases of common stock	(1,422)	(1,489)
Repayments of debt and other obligations	(1,250)	(4,500)
Payments of dividends	(1,617)	(1,493)
Other	(75)	(424)
Net cash used in financing activities	(4,223)	(7,747)
Effect of exchange rate changes on cash and cash equivalents	11	(45)
Net change in cash and cash equivalents	(6,700)	5,646
Cash and cash equivalents at beginning of period	17,940	7,588
Cash and cash equivalents at end of period	$ 11,240	$ 13,234