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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 1,703	$ 1,697
Convertible senior notes
Debt Instrument [Line Items]
Total convertible senior notes	1,661	1,660
Convertible senior notes | 1.375% convertible senior notes due 2026
Debt Instrument [Line Items]
Total convertible senior notes	$ 495	495
Stated Interest Rate	1.375%
Convertible senior notes | 2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Total convertible senior notes	$ 560	560
Stated Interest Rate	2.75%
Convertible senior notes | 0.75% convertible senior notes due 2024
Debt Instrument [Line Items]
Total convertible senior notes	$ 606	605
Stated Interest Rate	0.75%
Credit facilities
Debt Instrument [Line Items]
Warehouse line of credit	$ 42	37
Credit Suisse AG, Cayman Islands | Credit facilities
Debt Instrument [Line Items]
Repurchase agreements	25	23
Citibank, N.A. | Credit facilities
Debt Instrument [Line Items]
Repurchase agreements	0	3
Comerica Bank | Line of Credit | Credit facilities
Debt Instrument [Line Items]
Warehouse line of credit	$ 17	$ 11

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

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