Debt and Borrowing Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt and Borrowing Arrangements
Total Debt	$ 1,332	$ 1,348
Committed warehouse facilities
Debt and Borrowing Arrangements
Total Debt	$ 628	632
Weighted Avg-Interest Rate (as a percent)	2.70%
Available Capacity	$ 622
Uncommitted warehouse facilities
Debt and Borrowing Arrangements
Total Debt	$ 0	0
Weighted Avg-Interest Rate (as a percent)	0.00%
Available Capacity	$ 2,800
Servicing advance facility
Debt and Borrowing Arrangements
Total Debt	$ 97	111
Weighted Avg-Interest Rate (as a percent)	2.50%
Available Capacity	$ 58
Term notes due in 2019
Debt and Borrowing Arrangements
Total Debt	$ 272	271
Stated interest rate (as a percentage)	7.375%
Term notes due in 2021
Debt and Borrowing Arrangements
Total Debt	$ 335	334
Stated interest rate (as a percentage)	6.375%
Unsecured debt
Debt and Borrowing Arrangements
Total Debt	$ 607	$ 605

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

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

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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

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- Definition

Weighted average interest rate of debt outstanding.

+ References

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