Shareholders Equity and Dividend Restrictions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Net income	$ 3,400	$ 4,000	$ 3,800
Surplus	13,300	$ 12,900	$ 13,800
Minimum statutory surplus required by regulators (1),(2)	4,900
Investments on deposit with regulatory bodies (3)	300
Maximum dividend distributions permitted in 2022 without regulatory approval (4)	3,200
Maximum loans to the parent company permitted without regulatory approval	800
Restricted GAAP net assets of Cigna Corporation's subsidiaries (5)	12,900
Minimum statutory surplus required by regulators, disposal groups	1,000
Investments on deposit with regulatory bodies, disposal groups	40
Maximum dividend distributions permitted in 2022 without regulatory approval, disposal groups	200
Restricted GAAP net assets of Cigna Corporation's subsidiaries, disposal groups	3,000
Undistributed earnings from equity method subidiaries	$ 1,100