CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Net interest revenues	$ 128	$ 63	$ 257	$ 193
Total net revenues	361	365	978	1,452
Operating expenses:
Brokerage and transaction	33	44	94	123
Technology and development	185	679	695	952
Operations	64	108	241	276
Marketing	19	87	77	283
General and administrative	234	790	728	1,039
Total operating expenses	535	1,708	1,835	2,673
Change in fair value of convertible notes and warrant liability	0	25	0	2,045
Other expense (income), net	0	(1)	2	(1)
Loss before income taxes	(174)	(1,367)	(859)	(3,265)
Provision for (benefit from) income taxes	1	(50)	3	(1)
Net loss	(175)	(1,317)	(862)	(3,264)
Net loss attributable to common stockholders:
Basic	(175)	(1,317)	(862)	(3,264)
Diluted	$ (175)	$ (1,317)	$ (862)	$ (3,264)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.20)	$ (2.06)	$ (0.99)	$ (8.85)
Diluted (in dollars per share)	$ (0.20)	$ (2.06)	$ (0.99)	$ (8.85)
Weighted-average shares used to compute net loss per share attributable to common stockholders:
Basic (in shares)	882,356,575	638,168,188	875,055,571	368,518,894
Diluted (in shares)	882,356,575	638,168,188	875,055,571	368,518,894
Transaction-based revenues
Revenues:
Revenues	$ 208	$ 267	$ 628	$ 1,138
Other revenues
Revenues:
Revenues	$ 25	$ 35	$ 93	$ 121