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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities      
Net loss $ (101) $ (528) $ (162)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 157 130 111
Share-based compensation 451 312 197
Amortization of right of use assets 23 23 24
Amortization of contract cost assets 30 42 37
Amortization of debt discount and debt issuance costs 26 104 102
Gain (loss) on extinguishment of debt 21 17 (1)
Impairment and restructuring costs 0 57 77
Inventory valuation adjustment 9 408 0
Other adjustments to reconcile net loss to net cash provided by (used in) operating activities (3) 12 (3)
Changes in operating assets and liabilities:      
Accounts receivable 82 (82) (7)
Mortgage loans held for sale 66 224 (294)
Inventory 3,904 (3,827) 345
Prepaid expenses and other assets 6 (82) (16)
Contract cost assets (18) (26) (42)
Lease liabilities (21) (29) (2)
Accounts payable 3 5 13
Accrued expenses and other current liabilities (71) 61 15
Accrued compensation and benefits (60) 13 10
Deferred revenue (7) 1 9
Other long-term liabilities 7 (12) 10
Net cash provided by (used in) operating activities 4,504 (3,177) 423
Investing activities      
Proceeds from maturities of investments 802 2,206 2,232
Proceeds from sales of investments 0 0 116
Purchases of investments (2,191) (516) (3,287)
Purchases of property and equipment (115) (74) (85)
Purchases of intangible assets (25) (31) (24)
Proceeds from sale of equity investment 0 0 10
Cash paid for acquisitions, net (4) (497) 0
Net cash provided by (used in) investing activities (1,533) 1,088 (1,038)
Financing activities      
Proceeds from issuance of convertible senior notes, net of issuance costs 0 0 553
Proceeds from issuance of Class C capital stock, net of issuance costs 0 545 412
Proceeds from issuance of term loan, net of issuance costs 0 1,138 0
Proceeds from borrowings on credit facilities 0 3,618 349
Repayments of borrowings on credit facilities (2,206) (1,780) (679)
Net borrowings (repayments) on warehouse line of credit and repurchase agreements (76) (197) 279
Repurchases of Class A common stock and Class C capital stock (947) (302) 0
Settlement of long-term debt (1,158) (1) (195)
Proceeds from exercise of stock options 46 127 444
Net cash provided by (used in) financing activities (4,341) 3,148 1,163
Net increase (decrease) in cash, cash equivalents and restricted cash during period (1,370) 1,059 548
Cash, cash equivalents and restricted cash at beginning of period 2,838 1,779 1,231
Cash, cash equivalents and restricted cash at end of period 1,468 2,838 1,779
Supplemental disclosures of cash flow information      
Cash paid for interest 50 109 51
Cash paid for taxes 6 0 0
Noncash transactions:      
Write-off of fully amortized intangible assets 203 58 63
Write-off of fully depreciated property and equipment 53 49 115
Capitalized share-based compensation 51 30 17
Issuance (settlement) of beneficial interests in securitizations $ (79) $ 63 $ 0