Basis of Presentation	6 Months Ended
Jun. 30, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of presentation	Note 1 – Basis of Presentation The Consolidated Financial Statements include the accounts of Cigna Corporation and its subsidiaries (either individually or collectively referred to as “Cigna,” the “Company,” “we,” “our” or “us”). 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. 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 2014 Form 10-K (including the Description of Business on page 66). 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, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Note 1 – Basis of Presentation

The Consolidated Financial Statements include the accounts of Cigna Corporation and its subsidiaries (either individually or collectively referred to as “Cigna,” the “Company,” “we,” “our” or “us”). 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.

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 2014 Form 10-K (including the Description of Business on page 66). 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.