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Shareholders Equity and Dividend Restrictions (Details) - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Net income $ 4.0 $ 3.8 $ 3.4
Surplus 12.9 $ 13.8 $ 12.2
Minimum statutory surplus required by regulators 4.9    
Investments on deposit with regulatory bodies 0.4    
Maximum dividend distributions permitted in 2021 without regulatory approval 2.5    
Maximum loans to the parent company permitted without regulatory approval 0.8    
Restricted GAAP net assets of Cigna Corporation's subsidiaries $ 13.5