UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Net (loss) income	$ (699)	$ 765
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	117	116
Provision for expected credit losses and chargebacks	262	40
Deferred income tax (benefit) expense	(97)	89
Net losses (gains) on marketable equity securities	307	(451)
Stock-based compensation expense and other stock-based payments	11	78
Operating lease amortization	46	42
Amortization of debt discount and debt issuance costs	14	14
Unrealized foreign currency transaction gains on Euro-denominated debt	(33)	0
Impairment of goodwill	489	0
Impairment of investment	100	0
Other	2	7
Changes in assets and liabilities:
Accounts receivable	760	(24)
Prepaid expenses and other current assets	(445)	(669)
Deferred merchant bookings and other current liabilities	(1,135)	561
Other long-term assets and liabilities	(79)	(418)
Net cash (used in) provided by operating activities	(380)	150
INVESTING ACTIVITIES:
Purchase of investments	(72)	(445)
Proceeds from sale and maturity of investments	1,885	2,665
Additions to property and equipment	(80)	(111)
Net cash provided by investing activities	1,733	2,109
FINANCING ACTIVITIES:
Proceeds from revolving credit facility and short-term borrowings	0	250
Repayments of short-term borrowings	0	(25)
Payments for repurchase of common stock	(1,281)	(2,773)
Net cash used in financing activities	(1,281)	(2,548)
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents	(21)	(2)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	51	(291)
Total cash and cash equivalents and restricted cash and cash equivalents, beginning of period (see Note 14)	6,332	2,645
Total cash and cash equivalents and restricted cash and cash equivalents, end of period (see Note 14)	6,383	2,354
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes (see Note 14)	762	816
Cash paid during the period for interest	$ 68	$ 68