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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 1,704 | $ 1,432
Convertible senior notes: |  |
Debt Instrument [Line Items] |  |
Total convertible senior notes | 1,659 | 1,319
Convertible senior notes: | 2026 Notes |  |
Debt Instrument [Line Items] |  |
Total convertible senior notes | $ 495 | 369
Stated Interest Rate | 1.375% |
Convertible senior notes: | 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total convertible senior notes | $ 559 | 443
Stated Interest Rate | 2.75% |
Convertible senior notes: | 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total convertible senior notes | $ 605 | 507
Stated Interest Rate | 0.75% |
Mortgages segment |  |
Debt Instrument [Line Items] |  |
Warehouse line of credit | $ 45 | 113
Credit Suisse AG, Cayman Islands | Mortgages segment |  |
Debt Instrument [Line Items] |  |
Repurchase agreements | 22 | 77
Citibank, N.A. | Mortgages segment |  |
Debt Instrument [Line Items] |  |
Repurchase agreements | 2 | 17
Comerica Bank | Line of Credit | Mortgages segment |  |
Debt Instrument [Line Items] |  |
Warehouse line of credit | $ 21 | $ 19

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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