CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Net income	$ 4,865	$ 3,998	$ 2,341
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	469	426	363
Provision for uncollectible accounts and chargebacks	138	163	62
Deferred income tax expense (benefit)	122	(150)	(32)
Net unrealized (gains) losses on marketable equity securities	(745)	367	0
Stock-based compensation expense and other stock-based payments	325	331	261
Amortization of debt discount and debt issuance costs	58	59	79
Operating lease amortization	172	0	0
Other	2	19	10
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(323)	(319)	(270)
Prepaid expenses and other current assets	(263)	(201)	(124)
Accounts payable, accrued expenses and other current liabilities	480	635	687
Long-term U.S. transition tax liability	(36)	40	1,251
Other long-term assets and liabilities	(399)	(30)	34
Net cash provided by operating activities	4,865	5,338	4,662
INVESTING ACTIVITIES:
Purchase of investments	(672)	(2,686)	(6,941)
Proceeds from sale and maturity of investments	8,099	5,616	3,580
Additions to property and equipment	(368)	(442)	(288)
Acquisitions and other investments, net of cash acquired	(9)	(273)	(553)
Net cash provided by (used in) investing activities	7,050	2,215	(4,202)
FINANCING ACTIVITIES:
Proceeds from revolving credit facility and short-term borrowings	400	25	0
Repayments of revolving credit facility and short-term borrowings	(425)	0	0
Proceeds from the issuance of long-term debt	0		2,045
Payments for conversion of senior notes	0	(1,487)	(286)
Payments for repurchase of common stock	(8,187)	(5,971)	(1,828)
Other financing activities	(8)	2	(10)
Net cash used in financing activities	(8,220)	(7,431)	(79)
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents	(8)	(40)	100
Net increase in cash and cash equivalents and restricted cash and cash equivalents	3,687	82	481
Total cash and cash equivalents and restricted cash and cash equivalents, beginning of period	2,645	2,563	2,082
Total cash and cash equivalents and restricted cash and cash equivalents, end of period	6,332	2,645	2,563
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes	1,074	1,169	702
Cash paid during the period for interest	221	219	155
Non-cash operating and financing activity for an acquisition (see Note 20)	0	51	0
Non-cash investing and financing activity for an acquisition (see Note 20)	$ 0	$ 59	$ 0