| **Subsequent Events (Details) - USD ($) $ in Millions**                                                       |        |          | 9 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------|--------|----------|----------------|-----------------|
||
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Capitalization servicing rate (as a percent)                                                                  |   |     | 0.73%          | 0.89%           |
| Servicing advances, net                                                                                       |   | $ 668    | $ 668          | $ 691           |
| Private label solutions, mortgage production volume percentage                                                |   |     | 78.00%         |            |
| Subsequent Event                                                                                              |   |     |           |            |
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Commitment to sell Mortgage Servicing Rights, amount requires consent of originator prior to sale, percentage | 30.00% |     |           |            |
| GNMA Loans                                                                                                    |   |     |           |            |
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Commitment to sell Mortgage Servicing Rights                                                                  |   | $ 14,800 | $ 14,800       |            |
| Capitalization servicing rate (as a percent)                                                                  |   | 0.70%    |           |            |
| Commitment to sell Mortgage servicing rights, fair value                                                      |   | $ 104    | 104            |            |
| Servicing advances, net                                                                                       |   | $ 16     | $ 16           |            |
| GNMA Loans | Subsequent Event                                                                                 |   |     |           |            |
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Commitment to sell Mortgage Servicing Rights, MSR GNMA sales price                                            | $ 122  |     |           |            |
| Private Label Services | Minimum | Subsequent Event                                                           |   |     |           |            |
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Exit costs                                                                                                    | 75     |     |           |            |
| Private Label Services | Maximum | Subsequent Event                                                           |   |     |           |            |
| **Subsequent Event [Line Items]**                                                                             |   |     |           |            |
| Exit costs                                                                                                    | $ 105  |     |           |            |

| X                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the fair value mortgage servicing rights subject to sale commitments and associated with loans included in the capitalized portfolio.
+ References
No definition available.
+ Details**Name:**phh_CommitmentToSellMortgageServicingRightsMSRFairValue**Namespace Prefix:**phh_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Commitment to Sell Mortgage Servicing Rights, Amount Requires Consent of Originator Prior to Sale, Percentage
+ References
No definition available.
+ Details**Name:**phh_CommitmenttoSellMortgageServicingRightsAmountRequiresConsentofOriginatorPriortoSalePercentage**Namespace Prefix:**phh_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Commitment to Sell Mortgage Servicing Rights, MSR GNMA Sales Price excluding transaction and other related costs.
+ References
No definition available.
+ Details**Name:**phh_CommitmenttoSellMortgageServicingRightsMSRGNMASalesPrice**Namespace Prefix:**phh_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the unpaid principal balance of loans where the Company has commitments to sell mortgage servicing rights.
+ References
No definition available.
+ Details**Name:**phh_CommitmenttoSellMortgageServicingRightsMSRUnpaidPrincipalBalance**Namespace Prefix:**phh_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Private Label Solutions, Mortgage Production Volume Percentage
+ References
No definition available.
+ Details**Name:**phh_PrivateLabelSolutionsMortgageProductionVolumePercentage**Namespace Prefix:**phh_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the capitalization rate used to estimate the fair value of servicing assets and servicing liabilities.
+ References
No definition available.
+ Details**Name:**phh_RatioOfMSRCarryingValueToPrincipalAmountOfLoansInCapitalizedServingPortfolio**Namespace Prefix:**phh_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of outstanding servicing advances made to meet contractual principal and interest payments to investors and to pay tax, insurance, foreclosure costs and various other items that are required to preserve the assets being serviced.
+ References
No definition available.
+ Details**Name:**phh_ServicingAdvancesNet**Namespace Prefix:**phh_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4
+ Details**Name:**us-gaap_BusinessExitCosts1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.
+ References
No definition available.
+ Details**Name:**us-gaap_SubsequentEventLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**phh_LoansSoldToGovernmentAuthoritiesAxis=phh_GovernmentNationalMortgageAssociationLoansMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ProductOrServiceAxis=phh_PrivateLabelServicesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |