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Securitizations and Financings (Tables) | 3 Months Ended
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Mar. 31, 2021
Variable Interest Entities and Securitizations [Abstract] |
Schedule of assets and liabilities of VIEs included in financial statements | A summary of the assets and liabilities of the Company’s transactions with VIEs included in the Company’s condensed consolidated balance sheets is presented below:
| March 31, 2021 |  | December 31, 2020
Consolidated Transactions with VIEs | Transfers Accounted for as Secured Borrowings |  | Reverse Secured Borrowings |  | Transfers Accounted for as Secured Borrowings |  | Reverse Secured Borrowings
Assets |  |  |  |  |  |  |
Restricted cash | $ | 80 |  |  | $ | 27 |  |  | $ | 47 |  |  | $ | 23 |
Advances and other receivables, net | 415 |  |  | — |  |  | 441 |  |  | — |
Reverse mortgage interests, net(1) | — |  |  | 4,159 |  |  | — |  |  | 4,356 |
Total assets | $ | 495 |  |  | $ | 4,186 |  |  | $ | 488 |  |  | $ | 4,379 |
Liabilities |  |  |  |  |  |  |
Advance facilities(2) | $ | 337 |  |  | $ | — |  |  | $ | 358 |  |  | $ | — |
Payables and other liabilities | — |  |  | — |  |  | 1 |  |  | — |
Participating interest financing | — |  |  | 3,306 |  |  | — |  |  | 3,473 |
HECM Securitizations (HMBS) |  |  |  |  |  |  |
Trust 2020-1 | — |  |  | 471 |  |  | — |  |  | 490 |
Trust 2019-2 | — |  |  | 232 |  |  | — |  |  | 241 |
Trust 2019-1 | — |  |  | 203 |  |  | — |  |  | 212 |
Total liabilities | $ | 337 |  |  | $ | 4,212 |  |  | $ | 359 |  |  | $ | 4,416 |
(1)Amounts include net purchase discount of $53 a nd $61 as of March 31, 2021 and December 31, 2020, respectively. (2)Refer to advance facilities in Note 9, Indebtedness, for additional information. The following table shows a summary of the outstanding collateral and certificate balances for securitization trusts for which the Company was the transferor, including any retained beneficial interests and MSRs, that were not consolidated by the Company:
Unconsolidated Securitization Trusts | March 31, 2021 |  | December 31, 2020
Total collateral balances - UPB | $ | 1,283 |  |  | $ | 1,326 |
Total certificate balances | $ | 1,281 |  |  | $ | 1,329 |
A summary of mortgage loans transferred by the Company to unconsolidated securitization trusts that are 60 days or more past due are presented below:
Principal Amount of Transferred Loans 60 Days or More Past Due | March 31, 2021 |  | December 31, 2020
Unconsolidated securitization trusts | $ | 147 |  |  | $ | 154 |

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- Definition Variable Interest Entities and Securitizations + References No definition available. + Details
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- Definition Tabular disclosure of the carrying amount and classification of assets and liabilities recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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