Document and Entity Information
| Document and Entity Information | Nov. 08, 2021 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001828937 |
| Document Type | 8-K |
| Document Period End Date | Nov. 8, 2021 |
| Entity Registrant Name | FINANCE OF AMERICA COMPANIES INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40308 |
| Entity Tax Identification Number | 85-3474065 |
| Entity Address, Address Line One | 909 Lake Carolyn Parkway |
| Entity Address, Address Line Two | Suite 1550 |
| Entity Address, City or Town | Irving |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75039 |
| City Area Code | (972) |
| Local Phone Number | 999-1833 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Class A Common Stock Par Value 0.0001 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | FOA |
| Security Exchange Name | NYSE |
| Warrants To Purchase Shares Of Class A Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase shares of Class A Common Stock |
| Trading Symbol | FOA.WS |
| Security Exchange Name | NYSE |