Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended	12 Months Ended
	Nov. 10, 2025	Nov. 07, 2025	Sep. 30, 2025	Dec. 31, 2023
Subsequent Event [Line Items]
Dividends declared (in dollars per share)			$ 0.06	$ 0.05
Subsequent event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.06
Subsequent event | American Well Intermediate Holdings, LLC | American Well Services, LLC
Subsequent Event [Line Items]
Ownership interests percentage		100.00%
American Well Intermediate Holdings, LLC | Subsequent event
Subsequent Event [Line Items]
Ownership (as a percent)		100.00%
Allocated purchase price		$ 90.5
Business combination cash paid		60.5
Contingent consideration		$ 5.0
American Well Intermediate Holdings, LLC | Subsequent event | Class A Common Stock
Subsequent Event [Line Items]
Issued shares		1,998,401