CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net loss	$ (571)	$ (862)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	54	44
Impairment of long-lived assets	12	47
Provision for credit losses	29	28
Share-based compensation	790	494
Other	(39)	8
Changes in operating assets and liabilities:
Receivables from brokers, dealers, and clearing organizations	13	13
Receivables from users, net	(502)	2,565
Securities borrowed	(687)	(139)
Deposits with clearing organizations	(89)	127
Current and non-current prepaid expenses	26	29
Other current and non-current assets	0	5
Accounts payable and accrued expenses	145	(45)
Payables to users	(376)	(1,080)
Securities loaned	1,411	(2,228)
Other current and non-current liabilities	5	(39)
Net cash provided by (used in) operating activities	221	(1,033)
Investing activities:
Purchases of property, software, and equipment	(1)	(25)
Capitalization of internally developed software	(14)	(22)
Purchases of available-for-sale investments	0	(24)
Proceeds from sales and maturities of available-for-sale investments	10	19
Purchases of held-to-maturity investments	(651)	0
Proceeds from maturities of held-to-maturity investments	167	0
Acquisitions of a business, net of cash and cash equivalents acquired	(90)	0
Other	0	(19)
Net cash used in investing activities	(579)	(71)
Financing activities:
Proceeds from issuance of common stock under the Employee Stock Purchase Plan (“ESPP”)	9	13
Taxes paid related to net share settlement of equity awards	(9)	(9)
Payments of debt issuance costs	(10)	(10)
Draws on credit facilities	20	21
Repayments on credit facilities	(20)	(21)
Change in principal collected from customers due to Coastal Bank	(3)	0
Proceeds from exercise of stock options, net of repurchases	2	6
Repurchase of common stock	(608)	0
Net cash provided by (used in) financing activities	(619)	0
Effect of foreign exchange rate changes on cash and cash equivalents	0	(2)
Net decrease in cash, cash equivalents, segregated cash and restricted cash	(977)	(1,106)
Cash, cash equivalents, segregated cash and restricted cash, beginning of the period	9,357	10,270
Cash, cash equivalents, segregated cash and restricted cash, end of the period	8,380	9,164
Reconciliation of cash, cash equivalents, segregated cash and restricted cash, end of the period:
Cash and cash equivalents, end of the period	4,889	6,187
Segregated cash, end of the period	3,448	2,954
Restricted cash in other current assets, end of the period	26	1
Restricted cash in other non-current assets, end of the period	17	22
Cash, cash equivalents, segregated cash and restricted cash, end of the period	8,380	9,164
Supplemental disclosures:
Cash paid for interest	8	6
Cash paid for income taxes, net of refund received	$ 9	$ 4