| **Debt and Borrowing Arrangements (Details) - USD ($) $ in Millions** | Mar. 31, 2016 | Dec. 31, 2015 |
|-----------------------------------------------------------------------|---------------|---------------|
| **Debt and Borrowing Arrangements**                                   |          |          |
| Total Debt                                                            | $ 1,310       | $ 1,348       |
| Committed warehouse facilities                                        |          |          |
| **Debt and Borrowing Arrangements**                                   |          |          |
| Total Debt                                                            | $ 602         | 632           |
| Weighted Avg-Interest Rate (as a percent)                             | 2.50%         |          |
| Available Capacity                                                    | $ 998         |          |
| Uncommitted warehouse facilities                                      |          |          |
| **Debt and Borrowing Arrangements**                                   |          |          |
| Total Debt                                                            | $ 0           | 0             |
| Weighted Avg-Interest Rate (as a percent)                             | 0.00%         |          |
| Available Capacity                                                    | $ 2,925       |          |
| Servicing advance facility                                            |          |          |
| **Debt and Borrowing Arrangements**                                   |          |          |
| Total Debt                                                            | $ 102         | 111           |
| Weighted Avg-Interest Rate (as a percent)                             | 2.30%         |          |
| Available Capacity                                                    | $ 53          |          |
| 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                                                            | $ 334         | 334           |
| Stated interest rate (as a percentage)                                | 6.375%        |          |
| Unsecured debt                                                        |          |          |
| **Debt and Borrowing Arrangements**                                   |          |          |
| Total Debt                                                            | $ 606         | $ 605         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_DebtInstrumentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the aggregate of total long-term debt, including current maturities and short-term debt.
+ References
No definition available.
+ Details**Name:**us-gaap_DebtLongtermAndShorttermCombinedAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average interest rate of debt outstanding.
+ References
No definition available.
+ Details**Name:**us-gaap_DebtWeightedAverageInterestRate**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                           |
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| X                                                                                                                                              |
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