| Document and Entity Information | Apr. 20, 2022 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001156039 |
| Document Type | 8-K/A |
| Document Period End Date | Apr. 20, 2022 |
| Entity Registrant Name | ANTHEM, INC. |
| Entity Incorporation State Country Code | IN |
| Entity File Number | 001-16751 |
| Entity Tax Identification Number | 35-2145715 |
| Entity Address, Address Line One | 220 Virginia Ave |
| Entity Address, City or Town | Indianapolis |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 46204 |
| City Area Code | (800) |
| Local Phone Number | 331-1476 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | ANTM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | This Amendment No. 1 on Form 8-K/A (this “Form 8-K/A”) is an amendment to the Current Report on Form 8-K of Anthem, Inc. (the “Company”), furnished on April 20, 2022 (the “Original Form 8-K”). Following the submission of the Original Form 8-K, the Company discovered that the incorrect item number was inadvertently tagged in the submission (Item 2.02 should have been tagged instead of Item 2.01). The Company is amending the Original Form 8-K for the sole purpose of correcting the item tag. No disclosure has changed from the Original Form 8-K. |
