| Document and Entity Information Document | Feb. 28, 2023 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2023 |
| Entity Registrant Name | FINANCE OF AMERICA COMPANIES INC. |
| Entity Central Index Key | 0001828937 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40308 |
| Entity Tax Identification Number | 85-3474065 |
| Entity Address, City or Town | Plano |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75024 |
| City Area Code | 877 |
| Local Phone Number | 202-2666 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Address, Address Line Two | Suite 400 |
| Entity Address, Address Line One | 5830 Granite Parkway |
| NEW YORK STOCK EXCHANGE, INC. [Member] | Common Class A [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | FOA |
| Security Exchange Name | NYSE |
| CBOE STOCK EXCHANGE [Member] | Common Class A [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase shares of Class A Common Stock |
| Trading Symbol | FOA.WS |
| Security Exchange Name | NYSE |
