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Shareholders Equity and Dividend Restrictions (Tables)
12 Months Ended
Dec. 31, 2016
Shareholders Equity And Dividend Restrictions [Abstract]  
Statutory net income and surplus
(In billions)201620152014
Net income $ 2.0$ 2.1$ 2.0
Surplus$ 8.5$ 8.0$ 7.5

(In billions)  2016
Minimum statutory surplus required by regulators    $ 2.7
Investments on deposit with regulatory bodies    $ 0.5
Maximum dividend distributions permitted in 2017 without state approval    $ 1.6
Maximum loans to the parent company permitted without state approval    $ 1.3
Restricted net assets of Cigna Corporation    $ 8.8