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Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 02, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets of discontinued operations | $ 3,722 |  | $ 3,722 |  |  | $ 5,347
Liabilities of discontinued operations | 3,740 |  | 3,740 |  |  | 5,203
Net (loss) income from discontinued operations | (11) | $ 27 | 3 | $ 11 |  |
Discontinued Operation, Loan Asset Retained | 95 |  | 95 |  |  |
Discontinued Operation, Loan Liability Retained | 91 |  | 91 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Champion Mortgage [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Restricted cash | 65 |  | 65 |  |  | 83
Reverse mortgage interests, net | 3,705 |  | 3,705 |  |  | 5,253
Other | 5 |  | 5 |  |  | 11
Loss recognized on classification as discontinued operations | (53) |  | (53) |  |  | 0
Assets of discontinued operations | 3,722 |  | 3,722 |  |  | 5,347
Advances and warehouse facilities, net | 98 |  | 98 |  |  | 505
Payables and other liabilities | 208 |  | 208 |  |  | 233
Mortgage servicing liabilities | 41 |  | 41 |  |  | 41
Other nonrecourse debt, net | 3,393 |  | 3,393 |  |  | 4,424
Liabilities of discontinued operations | 3,740 |  | 3,740 |  |  | $ 5,203
Revenue - service related, net | 4 | 9 | 13 | 35 |  |
Salaries, wages and benefits expense | (7) | (10) | (23) | (32) |  |
General and administrative expense | (14) | 33 | 50 | 15 |  |
Interest income | 31 | 40 | 118 | 136 |  |
Interest expense | (26) | (37) | (90) | (140) |  |
Loss on classification as discontinued operations | (3) | 0 | (64) | 0 |  |
(Loss) income from discontinued operations before income tax (benefit) expense | (15) | 35 | 4 | 14 |  |
Less: Income tax (benefit) expense | (4) | 8 | 1 | 3 |  |
Net (loss) income from discontinued operations | (11) | $ 27 | 3 | $ 11 |  |
Disposal Group, Discontinued Operation, Transaction Cost | $ 0 |  | $ 5 |  |  |
Disposal Group, Including Discontinued Operation, Net Assets Transferred |  |  |  |  | $ 1,039 |

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Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=nsm_ChampionMortgageMember
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Data Type: | na
Balance Type: |
Period Type: |