Description of Business	12 Months Ended
Dec. 31, 2018
Description Of Business [Abstract]
Description of Business	Note 1 – 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 service organization dedicated to a mission of helping those we serve improve their health, well-being and peace of mind. Our evolved strategy in support of our mission is Go Deeper, Go Local, Go Beyond using a differentiated set of medical, pharmacy, dental, disability, life and accident insurance and related products and services offered 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. As described more fully in Note 3, on March 8, 2018, the Company entered into a merger agreement with Express Scripts Holding Company (“Express Scripts”). Following entry into the merger agreement and throughout the pendency of the transaction, Cigna and Express Scripts designed integration plans to implement a new management and business reporting structure for the combined company immediately upon closing. On December 20, 2018, Cigna completed the acquisition of Express Scripts. As a result, our segments have changed as described below, effective in the fourth quarter of 2018. Financial data for all prior periods presented was restated to reflect this new segment presentation. Integrated Medical offers a variety of medical solutions to employers and individuals. The Commercial operating segment serves employers (also referred to as “clients”) and their employees (also referred to as “customers”) and other groups. This segment provides deeply integrated medical and specialty offerings including medical, pharmacy, dental, behavioral health and vision, health advocacy programs and other products and services to insured and self-insured clients. The Government operating segment offers Medicare Advantage, Medicare Supplement, and Medicare Part D plans to Medicare-eligible beneficiaries as well as Medicaid plans. This operating segment also offers health insurance coverage to individual customers both on and off the public exchanges. This segment includes the acquired Express Scripts’ Medicare Part D business. Health Services includes pharmacy benefits management (“PBM”), pharmacy home delivery, and certain medical management services. This segment includes Express Scripts’ business from the date of acquisition with the exception of Express Scripts’ Medicare Part D business that is reported in the Government operating segment. International Markets includes supplemental health, life and accident insurance products and health care coverage in our international markets as well as health care benefits to 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. 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. Certain international run-off businesses Corporate reflects amounts not allocated to operating segments, including interest expense, net investment income on investments not supporting segment and other operations, interest on uncertain tax positions, certain litigation matters, compensation cost for stock options and related excess tax benefits, expense associated with our frozen pension plans, severance, certain overhead and project costs and intersegment eliminations for products and services sold between segments.

Description of Business

12 Months Ended

Dec. 31, 2018

Note 1 – 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 service organization dedicated to a mission of helping those we serve improve their health, well-being and peace of mind. Our evolved strategy in support of our mission is Go Deeper, Go Local, Go Beyond using a differentiated set of medical, pharmacy, dental, disability, life and accident insurance and related products and services offered 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.

As described more fully in Note 3, on March 8, 2018, the Company entered into a merger agreement with Express Scripts Holding Company (“Express Scripts”). Following entry into the merger agreement and throughout the pendency of the transaction, Cigna and Express Scripts designed integration plans to implement a new management and business reporting structure for the combined company immediately upon closing. On December 20, 2018, Cigna completed the acquisition of Express Scripts. As a result, our segments have changed as described below, effective in the fourth quarter of 2018. Financial data for all prior periods presented was restated to reflect this new segment presentation.

Integrated Medical offers a variety of medical solutions to employers and individuals.

The Commercial operating segment serves employers (also referred to as “clients”) and their employees (also referred to as “customers”) and other groups. This segment provides deeply integrated medical and specialty offerings including medical, pharmacy, dental, behavioral health and vision, health advocacy programs and other products and services to insured and self-insured clients.
The Government operating segment offers Medicare Advantage, Medicare Supplement, and Medicare Part D plans to Medicare-eligible beneficiaries as well as Medicaid plans. This operating segment also offers health insurance coverage to individual customers both on and off the public exchanges. This segment includes the acquired Express Scripts’ Medicare Part D business.

Health Services includes pharmacy benefits management (“PBM”), pharmacy home delivery, and certain medical management services. This segment includes Express Scripts’ business from the date of acquisition with the exception of Express Scripts’ Medicare Part D business that is reported in the Government operating segment.

International Markets includes supplemental health, life and accident insurance products and health care coverage in our international markets as well as health care benefits to 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.

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.

Certain international run-off businesses

Corporate reflects amounts not allocated to operating segments, including interest expense, net investment income on investments not supporting segment and other operations, interest on uncertain tax positions, certain litigation matters, compensation cost for stock options and related excess tax benefits, expense associated with our frozen pension plans, severance, certain overhead and project costs and intersegment eliminations for products and services sold between segments.