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Shareholders Equity and Dividend Restrictions (Tables)
12 Months Ended
Dec. 31, 2018
Shareholders Equity And Dividend Restrictions [Abstract]  
Statutory net income and surplus
(In billions)201820172016
Net income $3.4$2.5$2.0
Surplus$12.2$10.4$8.5

(In billions)2018
Minimum statutory surplus required by regulators$3.9
Investments on deposit with regulatory bodies$0.6
Maximum dividend distributions permitted in 2019 without regulatory approval$2.1
Maximum loans to the parent company permitted without regulatory approval$1.3
Restricted GAAP net assets of Cigna Corporation's subsidiaries$15.5