Basis of Presentation	6 Months Ended
Jun. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of presentation	Note 1 – Basis of Presentation and Significant Events Basis of Presentation Cigna Corporation, together with its subsidiaries (either individually or collectively referred to as “Cigna,” the “Company,” “we,” “our” or “us”) is a global health services organization dedicated to a mission of helping individuals improve their health, well-being and sense of security. To execute on our mission, Cigna's strategy is to “Go Deep”, “Go Global” and “Go Individual” with a differentiated set of medical, dental, disability, life and accident insurance and related products and services offered by our insurance and other subsidiaries. The majority of these products are offered through employers and other groups (e.g. governmental and non-governmental organizations, unions and associations). Cigna also offers commercial health and dental insurance, Medicare and Medicaid products and health, life and accident insurance coverages to individuals in the U.S. and selected international markets. In addition to its ongoing operations described above, Cigna also has certain run-off operations. The Consolidated Financial Statements include the accounts of Cigna Corporation and its subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. These Consolidated Financial Statements were prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Amounts recorded in the Consolidated Financial Statements necessarily reflect management's estimates and assumptions about medical costs, investment valuation, interest rates and other factors. Significant estimates are discussed throughout these Notes; however, actual results could differ from those estimates. The impact of a change in estimate is generally included in earnings in the period of adjustment. Certain reclassifications have been made to prior year amounts to conform to the current presentation. See Note 2 for further discussion. These interim Consolidated Financial Statements are unaudited but include all adjustments (including normal recurring adjustments) necessary, in the opinion of management, for a fair statement of financial position and results of operations for the periods reported. The interim Consolidated Financial Statements and Notes should be read in conjunction with the Consolidated Financial Statements and Notes included in the Company's 2015 Form 10-K. The preparation of interim Consolidated Financial Statements necessarily relies heavily on estimates. This and certain other factors, including the seasonal nature of portions of the health care and related benefits business as well as competitive and other market conditions, call for caution in estimating full year results based on interim results of operations.

Basis of Presentation

6 Months Ended

Jun. 30, 2016

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Note 1 – Basis of Presentation and Significant Events

Basis of Presentation

Cigna Corporation, together with its subsidiaries (either individually or collectively referred to as “Cigna,” the “Company,” “we,” “our” or “us”) is a global health services organization dedicated to a mission of helping individuals improve their health, well-being and sense of security. To execute on our mission, Cigna's strategy is to “Go Deep”, “Go Global” and “Go Individual” with a differentiated set of medical, dental, disability, life and accident insurance and related products and services offered by our insurance and other subsidiaries. The majority of these products are offered through employers and other groups (e.g. governmental and non-governmental organizations, unions and associations). Cigna also offers commercial health and dental insurance, Medicare and Medicaid products and health, life and accident insurance coverages to individuals in the U.S. and selected international markets. In addition to its ongoing operations described above, Cigna also has certain run-off operations.

The Consolidated Financial Statements include the accounts of Cigna Corporation and its subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. These Consolidated Financial Statements were prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Amounts recorded in the Consolidated Financial Statements necessarily reflect management's estimates and assumptions about medical costs, investment valuation, interest rates and other factors. Significant estimates are discussed throughout these Notes; however, actual results could differ from those estimates. The impact of a change in estimate is generally included in earnings in the period of adjustment. Certain reclassifications have been made to prior year amounts to conform to the current presentation. See Note 2 for further discussion.

These interim Consolidated Financial Statements are unaudited but include all adjustments (including normal recurring adjustments) necessary, in the opinion of management, for a fair statement of financial position and results of operations for the periods reported. The interim Consolidated Financial Statements and Notes should be read in conjunction with the Consolidated Financial Statements and Notes included in the Company's 2015 Form 10-K. The preparation of interim Consolidated Financial Statements necessarily relies heavily on estimates. This and certain other factors, including the seasonal nature of portions of the health care and related benefits business as well as competitive and other market conditions, call for caution in estimating full year results based on interim results of operations.