| Document And Entity Information | Aug. 04, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 04, 2022 |
| Entity Registrant Name | American Well Corporation |
| Entity Central Index Key | 0001393584 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-39515 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 20-5009396 |
| Entity Address, Address Line One | 75 State Street |
| Entity Address, Address Line Two | 26th Floor |
| Entity Address, City or Town | Boston |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02109 |
| City Area Code | 617 |
| Local Phone Number | 204-3500 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.01 Par Value |
| Trading Symbol | AMWL |
| Security Exchange Name | NYSE |
