Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net income (loss)	$ (57)	$ 24
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	85	87
Share-based compensation	233	193
Amortization of right of use assets	12	11
Amortization of contract cost assets	11	16
Amortization of debt discount and debt issuance costs	3	24
Loss on extinguishment of debt	0	21
Amortization of Debt Discount	(20)	(11)
Other adjustments to reconcile net income (loss) to net cash provided by operating activities	1	11
Changes in operating assets and liabilities:
Accounts receivable	(19)	81
Mortgage loans held for sale	(32)	46
Inventory	0	3,881
Prepaid expenses and other assets	(30)	4
Contract cost assets	(11)	(8)
Lease liabilities	(15)	(8)
Accounts payable	0	(1)
Accrued expenses and other current liabilities	27	(69)
Accrued compensation and benefits	2	(47)
Deferred revenue	5	1
Other long-term liabilities	(2)	(1)
Net cash provided by operating activities	193	4,255
Investing activities
Proceeds from maturities of investments	806	160
Purchases of investments	(638)	(1,023)
Purchases of property and equipment	(66)	(60)
Purchases of intangible assets	(18)	(11)
Net cash provided by (used in) investing activities	84	(934)
Financing activities
Repayments of borrowings on credit facilities	0	(2,205)
Net borrowings (repayments) on warehouse line of credit and repurchase agreements	29	(58)
Repurchases of Class A common stock and Class C capital stock	(236)	(597)
Settlement of long-term debt	0	(1,158)
Proceeds from exercise of stock options	30	42
Net cash used in financing activities	(177)	(3,976)
Net increase (decrease) in cash, cash equivalents and restricted cash during period	100	(655)
Cash, cash equivalents and restricted cash at beginning of period	1,468	2,838
Cash, cash equivalents and restricted cash at end of period	1,568	2,183
Noncash transactions:
Capitalized share-based compensation	38	20
Write-off of fully depreciated property and equipment	16	33
Write-off of fully amortized intangible assets	2	196
Recognition of operating right of use assets and lease liabilities	0	14
Settlement of beneficial interests in securitizations	$ 0	$ 79