CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Net interest revenues	$ 929	$ 424	$ 256
Total net revenues	1,865	1,358	1,815
Operating expenses:
Brokerage and transaction	146	179	158
Technology and development	805	878	1,234
Operations	159	285	368
Marketing	122	103	325
General and administrative	1,169	924	1,371
Total operating expenses	2,401	2,369	3,456
Change in fair value of convertible notes and warrant liability	0	0	2,045
Other (income) expense, net	(3)	16	(1)
Loss before income taxes	(533)	(1,027)	(3,685)
Provision for income taxes	8	1	2
Net loss	(541)	(1,028)	(3,687)
Net loss attributable to common stockholders:
Basic	(541)	(1,028)	(3,687)
Diluted	$ (541)	$ (1,028)	$ (3,687)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.61)	$ (1.17)	$ (7.49)
Diluted (in dollars per share)	$ (0.61)	$ (1.17)	$ (7.49)
Weighted-average shares used to compute net loss per share attributable to common stockholders:
Basic (in shares)	890,857,659	878,630,024	492,381,190
Diluted (in shares)	890,857,659	878,630,024	492,381,190
Transaction-based revenues
Revenues:
Revenues	$ 785	$ 814	$ 1,402
Other revenues
Revenues:
Revenues	$ 151	$ 120	$ 157