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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | May 19, 2020 | May 15, 2020 | Oct. 09, 2019
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 1,697 | $ 1,432 |  |  |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total convertible senior notes | 1,660 | 1,319 |  |  |
Convertible Debt | 1.375% convertible senior notes due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total convertible senior notes | $ 495 | 369 |  |  |
Stated Interest Rate | 1.375% |  |  |  |
Convertible Debt | 2.75% convertible senior notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total convertible senior notes | $ 560 | 443 |  |  |
Stated Interest Rate | 2.75% |  | 2.75% | 2.75% |
Convertible Debt | 0.75% convertible senior notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total convertible senior notes | $ 605 | 507 |  |  |
Stated Interest Rate | 0.75% |  |  |  | 0.75%
Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warehouse lines of credit | $ 37 | 113 |  |  |
Credit Suisse AG, Cayman Islands | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repurchase agreements | 23 | 77 |  |  |
Citibank, N.A. | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repurchase agreements | 3 | 17 |  |  |
Comerica Bank | Line of Credit | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warehouse lines of credit | $ 11 | $ 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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