CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (954)	$ (471)
Adjustments to reconcile net loss to cash, cash equivalents, and restricted cash used in operating activities:
Depreciation and amortization	59	30
Amortization of right of use asset	6	6
Stock-based compensation	178	465
Warrant fair value adjustment	0	(12)
Gain on settlement of lease liabilities	0	(5)
Inventory valuation adjustment	663	32
Changes in fair value of equity securities	36	(51)
Net fair value adjustments and loss on sale of mortgage loans held for sale	(1)	(3)
Origination of mortgage loans held for sale	(118)	(154)
Proceeds from sale and principal collections of mortgage loans held for sale	128	142
Changes in operating assets and liabilities:
Escrow receivable	(70)	(120)
Real estate inventory	(663)	(5,806)
Other assets	0	(50)
Accounts payable and other accrued liabilities	73	102
Interest payable	4	3
Lease liabilities	(6)	(12)
Net cash used in operating activities	(665)	(5,904)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(33)	(23)
Purchase of intangible assets	0	(1)
Purchase of marketable securities	(28)	(459)
Proceeds from sales, maturities, redemptions and paydowns of marketable securities	293	86
Purchase of non-marketable equity securities	(25)	(15)
Proceeds from sale of non-marketable equity securities	3	0
Capital returns from non-marketable equity securities	3	0
Acquisitions, net of cash acquired	(3)	(20)
Net cash provided by (used in) investing activities	210	(432)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of convertible senior notes, net of issuance costs	0	953
Purchase of capped calls related to the convertible senior notes	0	(119)
Proceeds from exercise of stock options	4	11
Proceeds from issuance of common stock for ESPP	2	0
Proceeds from warrant exercise	0	22
Proceeds from the February 2021 Offering	0	886
Issuance cost of common stock	0	(29)
Proceeds from non-recourse asset-backed debt	9,160	7,782
Principal payments on non-recourse asset-backed debt	(8,179)	(2,837)
Proceeds from other secured borrowings	114	151
Principal payments on other secured borrowings	(121)	(138)
Payment of loan origination fees and debt issuance costs	(24)	(9)
Net cash provided by financing activities	956	6,673
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	501	337
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – Beginning of period	2,578	1,506
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – End of period	3,079	1,843
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION – Cash paid during the period for interest	248	57
DISCLOSURES OF NONCASH ACTIVITIES:
Stock-based compensation expense capitalized for internally developed software	13	9
Issuance of common stock in extinguishment of warrant liabilities	0	(35)
RECONCILIATION TO CONDENSED CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents	1,327	1,359
Restricted cash	1,752	484
Cash, cash equivalents, and restricted cash	$ 3,079	$ 1,843