| Cover | Jan. 31, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 31, 2022 |
| Entity File Number | 001-39668 |
| Entity Registrant Name | Archer Aviation Inc. |
| Entity Central Index Key | 0001824502 |
| Entity Tax Identification Number | 83-2292321 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1880 Embarcadero Road |
| Entity Address, City or Town | Palo Alto |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94303 |
| City Area Code | 650 |
| Local Phone Number | 272-3233 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | ACHR |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price $11.50 per share |
| Trading Symbol | ACHR WS |
| Security Exchange Name | NYSE |
