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Short-Term Debt - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Apr. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Nov. 30, 2014	Mar. 31, 2013
Short-term Debt [Line Items]
Trading securities pledged as collateral	$ 747,000,000
Average balance of short-term debt	1,600,000,000	$ 1,080,000,000
Accrued interest payable on short-term debt	4,000,000	2,000,000
Convertible notes	201,000,000	250,000,000
Committed line of credit	10,000,000
Collateral at fair value	4,000,000
Committed line of credit with financial institutions, outstanding	0	0
Convertible senior notes due 2018 | Convertible notes
Short-term Debt [Line Items]
Convertible notes		288,000,000					$ 288,000,000
Debt instrument interest rate				4.625%			4.625%
Deferred debt issuance costs		2,000,000
Repurchased debt instrument, face amount		37,000,000
Gain (loss) on extinguishment of debt		(1,000,000)
Convertible notes			$ 250,000,000
Exchangeable senior notes due 2019 | Convertible notes
Short-term Debt [Line Items]
Accrued interest payable on short-term debt	1,000,000
Convertible notes	201,000,000					$ 205,000,000
Debt instrument interest rate						5.625%
Deferred debt issuance costs	1,000,000
Repurchased debt instrument, face amount					$ 4,000,000
Residential loans
Short-term Debt [Line Items]
Loan pledged as collateral		1,150,000,000
Residential
Short-term Debt [Line Items]
AFS securities pledged as collateral	844,000,000	$ 788,000,000
Single-family rental loans, held-for-sale at fair value
Short-term Debt [Line Items]
Collateral amounts	28,000,000
Residential bridge loans held-for-investment
Short-term Debt [Line Items]
Collateral amounts	98,000,000
Residential Loans
Short-term Debt [Line Items]
Loan pledged as collateral	935,000,000
Servicer advance financing
Short-term Debt [Line Items]
Collateral amounts	287,000,000
Accrued interest payable on short-term debt	1,000,000
Unamortized capitalized commitment costs	3,000,000
Sequoia Choice | Sequoia Securities
Short-term Debt [Line Items]
Trading securities pledged as collateral	130,000,000
Freddie Mac SLST | Sequoia Securities
Short-term Debt [Line Items]
Trading securities pledged as collateral	229,000,000
Freddie Mac K-Series | Sequoia Securities
Short-term Debt [Line Items]
Trading securities pledged as collateral	$ 18,000,000

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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