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

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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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