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Common and Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2018
Common And Preferred Stock [Abstract]  
Schedule of issued shares
(Shares in thousands)201820172016
Common: Par value $0.25; 600,000 shares authorized - Old Cigna
Outstanding - January 1,243,967256,869256,544
Issued for stock option exercises and other benefit plans1,1182,7611,110
Repurchased common stock(1,300)(15,663)(785)
Balance, December 20, 2018 (Merger Date)243,785--
Exchange of Old Cigna shares for shares of Cigna (243,785)--
Outstanding - December 31,-243,967256,869
Retirement of treasury stock on December 20, 2018(52,358)--
Exchange of Old Cigna certificated treasury stock for new Cigna certificated treasury stock(2)--
Treasury stock - December 31, 2018-52,17839,276
Issued - December 31,-296,145296,145
Common: Par value $0.01; 600,000 shares authorized - Cigna
Shares issued to Old Cigna shareholders243,785--
Shares issued to Express Scripts shareholders137,337--
Issued for stock option exercises and other benefit plans including Express Scripts performance share holders91--
Repurchased common stock(289)--
Outstanding - December 31, 2018380,924--
Treasury stock570--
Issued - December 31, 2018381,494--