Description of Business	12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business 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 with a mission of helping those we serve improve their health, well-being and peace of mind. We offer a differentiated set of pharmacy, medical, dental, disability, life and accident insurance and related products and services by our subsidiaries. The majority of these products are offered through employers and other groups such as 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 United States and selected international markets. In addition to these ongoing operations, Cigna also has certain run-off operations. The Company reports its results in the segments detailed below: In connection with the launch of Evernorth in the third quarter 2020, two reporting segments were re-named: Health Services was renamed as Evernorth and Integrated Medical was renamed as U.S. Medical. In addition, two of our operating segments were re-named: Commercial and Government were renamed as U.S. Commercial and U.S. Government, respectively. There were no changes to the underlying businesses reported in the segments. Evernorth includes a broad range of coordinated and point solution health services capabilities, as well as those from partners across the health care system in pharmacy solutions, benefits management solutions, care solutions and intelligence solutions, which are provided to health plans, employers, government organizations and health care providers. U.S. Medical includes Cigna’s U.S. Commercial and U.S. Government businesses that provide comprehensive medical and coordinated solutions to clients and customers. U.S. Commercial products and services include medical, pharmacy, behavioral health, dental, vision, health advocacy programs and other products and services for insured and self-insured clients. U.S. Government solutions include Medicare Advantage, Medicare Supplement, and Medicare Part D plans for seniors, Medicaid plans, and individual health insurance plans both on and off the public exchanges. International Markets includes supplemental health, life and accident insurance products and health care coverage in our international markets, as well as health care benefits for globally mobile employees of multinational organizations. The remainder of our business operations are reported in Group Disability and Other, consisting of the following: •Group Disability and Life provides group long-term and short-term disability, group life, accident, voluntary and specialty insurance products and related services. On December 31, 2020, Cigna completed the sale of its U.S. Group Disability and Life business to New York Life Insurance Company. See Note 5 for additional information. •Corporate-Owned Life Insurance (“COLI”) offers permanent insurance contracts sold to corporations to provide coverage on the lives of certain employees for the purpose of financing employer-paid future benefit obligations. •Run-off businesses: •Reinsurance: predominantly comprised of guaranteed minimum death benefit (“GMDB”) and guaranteed minimum income benefit (“GMIB”) business effectively exited through reinsurance with Berkshire Hathaway Life Insurance Company of Nebraska (“Berkshire”) in 2013. •Settlement Annuity business in run-off. •Individual Life Insurance and Annuity and Retirement Benefits businesses: deferred gains from the sales of these businesses. Corporate reflects amounts not allocated to operating segments, including net interest expense (defined as interest on corporate debt less net investment income on investments not supporting segment and other operations), certain litigation matters, expense associated with our frozen pension plans, charitable contributions, severance, certain overhead and project costs and intersegment eliminations for products and services sold between segments.

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 with a mission of helping those we serve improve their health, well-being and peace of mind. We offer a differentiated set of pharmacy, medical, dental, disability, life and accident insurance and related products and services by our subsidiaries.

The majority of these products are offered through employers and other groups such as 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 United States and selected international markets. In addition to these ongoing operations, Cigna also has certain run-off operations.

In connection with the launch of Evernorth in the third quarter 2020, two reporting segments were re-named: Health Services was renamed as Evernorth and Integrated Medical was renamed as U.S. Medical. In addition, two of our operating segments were re-named: Commercial and Government were renamed as U.S. Commercial and U.S. Government, respectively. There were no changes to the underlying businesses reported in the segments.

Evernorth includes a broad range of coordinated and point solution health services capabilities, as well as those from partners across the health care system in pharmacy solutions, benefits management solutions, care solutions and intelligence solutions, which are provided to health plans, employers, government organizations and health care providers.

U.S. Medical includes Cigna’s U.S. Commercial and U.S. Government businesses that provide comprehensive medical and coordinated solutions to clients and customers. U.S. Commercial products and services include medical, pharmacy, behavioral health, dental, vision, health advocacy programs and other products and services for insured and self-insured clients. U.S. Government solutions include Medicare Advantage, Medicare Supplement, and Medicare Part D plans for seniors, Medicaid plans, and individual health insurance plans both on and off the public exchanges.

International Markets includes supplemental health, life and accident insurance products and health care coverage in our international markets, as well as health care benefits for globally mobile employees of multinational organizations.

The remainder of our business operations are reported in Group Disability and Other, consisting of the following:

•Group Disability and Life provides group long-term and short-term disability, group life, accident, voluntary and specialty insurance products and related services. On December 31, 2020, Cigna completed the sale of its U.S. Group Disability and Life business to New York Life Insurance Company. See Note 5 for additional information.

•Corporate-Owned Life Insurance (“COLI”) offers permanent insurance contracts sold to corporations to provide coverage on the lives of certain employees for the purpose of financing employer-paid future benefit obligations.

•Reinsurance: predominantly comprised of guaranteed minimum death benefit (“GMDB”) and guaranteed minimum income benefit (“GMIB”) business effectively exited through reinsurance with Berkshire Hathaway Life Insurance Company of Nebraska (“Berkshire”) in 2013.

•Individual Life Insurance and Annuity and Retirement Benefits businesses: deferred gains from the sales of these businesses.

Corporate reflects amounts not allocated to operating segments, including net interest expense (defined as interest on corporate debt less net investment income on investments not supporting segment and other operations), certain litigation matters, expense associated with our frozen pension plans, charitable contributions, severance, certain overhead and project costs and intersegment eliminations for products and services sold between segments.