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Cover Page - shares
 9 Months Ended
Sep. 30, 2023
Oct. 27, 2023
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Trading Symbol AMWL  
Entity Registrant Name American Well Corporation  
Entity Central Index Key 0001393584  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Quarterly Report true  
Document Transition Report false  
Security Exchange Name NYSE  
Title of 12(b) Security Class A common stock,par value of $0.01 per share  
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  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   254,623,284
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   27,390,397
Common Class C [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   5,555,555