| Document And Entity Information | Mar. 03, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 3, 2022 |
| Entity Registrant Name | agilon health, inc. |
| Entity Central Index Key | 0001831097 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-40332 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 37-1915147 |
| Entity Address, Address Line One | 6210 E Hwy 290, Suite 450 |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78723 |
| City Area Code | 562 |
| Local Phone Number | 256-3800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | AGL |
| Security Exchange Name | NYSE |
