Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES
Net income (loss)	$ 309	$ (1,757)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	39	33
Stock-based compensation expense	214	2,614
Provision for bad debts	16	18
Amortization of operating lease right-of-use assets	9	11
Deferred income taxes	55	(394)
Other	2	(3)
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(112)	(17)
Prepaid expenses and other assets	(7)	14
Accounts payable	(3)	(31)
Accrued and other current liabilities	18	(108)
Deferred revenue	13	22
Operating lease liabilities	(12)	(11)
Other long-term liabilities	(7)	(38)
Net cash provided by operating activities	534	353
INVESTING ACTIVITIES
Purchases of marketable securities	(25)	(90)
Maturities of marketable securities	54	274
Purchases of property and equipment, including capitalized internal-use software	(52)	(38)
Other investing activities	(3)	0
Net cash provided by (used in) investing activities	(26)	146
FINANCING ACTIVITIES
Proceeds from the issuance of common stock upon initial public offering, net of underwriting discounts	0	401
Proceeds from the issuance of Series A redeemable convertible preferred stock	0	175
Taxes paid related to net share settlement of equity awards	(92)	(570)
Proceeds from exercise of stock options	76	3
Changes in advances from payment card issuer	57	0
Deferred offering costs paid	0	(3)
Repurchases of common stock	(1,397)	0
Net cash provided by (used in) financing activities	(1,356)	6
Effect of foreign exchange on cash, cash equivalents, and restricted cash and cash equivalents	(4)	0
Net increase (decrease) in cash, cash equivalents, and restricted cash and cash equivalents	(852)	505
Cash, cash equivalents, and restricted cash and cash equivalents - beginning of period	2,293	1,599
Cash, cash equivalents, and restricted cash and cash equivalents - end of period	1,441	2,104
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes, net of tax refunds	13	40
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Stock-based compensation capitalized as internal-use software	27	41
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	0	2,822
Reclassification of deferred offering costs to additional paid-in capital upon initial public offering	0	9
Changes in accrued purchases of property and equipment, including capitalized internal-use software	(2)	3
Deferred offering costs not yet paid	0	3
Accretion of Series A redeemable convertible preferred stock	7	0
RECONCILIATION OF CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AND CASH EQUIVALENTS TO THE CONDENSED CONSOLIDATED BALANCE SHEETS
Cash and cash equivalents	1,288	2,010
Restricted cash and cash equivalents, current	134	75
Restricted cash and cash equivalents, noncurrent	19	19
Total cash, cash equivalents, and restricted cash and cash equivalents	$ 1,441	$ 2,104