|
Document and Entity Information
|
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Document Information [Line Items] | |
| Document Type | 10-Q |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2012 |
| Document Fiscal Year Focus | 2012 |
| Document Fiscal Period Focus | Q2 |
| Trading Symbol | HUM |
| Entity Registrant Name | HUMANA INC |
| Entity Central Index Key | 0000049071 |
| Current Fiscal Year End Date | --12-31 |
| Entity Filer Category | Large Accelerated Filer |
| Entity Common Stock, Shares Outstanding | 161,712,439 |