Debt and Borrowing Arrangements - Components of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt and Borrowing Arrangements
Mortgage warehouse and advance facilities	$ 59	$ 117
Unsecured debt, face value	119	119
Debt issuance costs	(1)	(1)
Unsecured debt, net	118	118
Total	177	235
Committed warehouse facilities
Debt and Borrowing Arrangements
Mortgage warehouse and advance facilities	$ 36	67
Weighted Avg-Interest Rate (as a percent)	4.30%
Available Capacity	$ 63
Uncommitted warehouse facilities
Debt and Borrowing Arrangements
Mortgage warehouse and advance facilities	$ 3	18
Weighted Avg-Interest Rate (as a percent)	0.00%
Available Capacity	$ 222
Servicing advance facility
Debt and Borrowing Arrangements
Mortgage warehouse and advance facilities	$ 20	32
Weighted Avg-Interest Rate (as a percent)	3.80%
Available Capacity	$ 5
Term notes due in 2019
Debt and Borrowing Arrangements
Unsecured debt, face value	$ 97	97
Stated interest rate (as a percent)	7.375%
Term notes due in 2021
Debt and Borrowing Arrangements
Unsecured debt, face value	$ 22	22
Stated interest rate (as a percent)	6.375%
Unsecured credit facilities
Debt and Borrowing Arrangements
Unsecured debt, face value	$ 0	$ 0
Stated interest rate (as a percent)	0.00%
Available Capacity	$ 3

Mortgage Warehouse And Servicing Advance Facilities

No definition available.

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- Definition

Unsecured Debt, Gross

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Name Accounting Standards Codification
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- Details

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