|
Document and Entity Information (USD $)
|
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2015
|
Apr. 15, 2015
|
Dec. 31, 2014
|
|
| Document Document And Entity Information [Abstract] | |||
| Document Type | 10-Q | ||
| Document Period End Date | Mar. 31, 2015 | ||
| Entity Registrant Name | CIGNA Corporation | ||
| Entity Central Index Key | 0000701221 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Trading Symbol | CI | ||
| Entity Common Stock Shares Outstanding | 257,367,068 | ||
| Amendment Flag | false | ||
| Entity Current Reporting Status | Yes | ||
| Entity Well Known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Document Fiscal Year Focus | 2015 | ||
| Document Fiscal Period Focus | Q1 | ||
| Common stock, par value per share | $ 0.25 | $ 0.25 |