Insurance and Contractholder Liabilities - Future Policy Benefits - Present Value of Expected Premiums and Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Observable inputs from published spot rate curve term (in years)	30 years
Cigna Healthcare
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	$ 8,557	$ 9,314
Reversal of effect of beginning of period discount rate assumptions	1,537	(367)
Effect of assumption changes and actual variances from expected experience			$ 0	$ 0
Issuances and lapses	306	143
Net premiums collected	(326)	(310)
Interest and other	56	46
Ending balance at original discount rate	10,130	8,826
Effect of end of period discount rate assumptions	(1,312)	(376)
Ending balance	8,818	8,450	8,557	9,314
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	8,945	9,794
Reversal of effect of discount rate assumptions	1,611	(379)
Effect of assumption changes and actual variances from expected experience			0	0
Issuances and lapses	307	215
Benefit payments	(326)	(385)
Interest and other	58	52
Ending balance at original discount rate	10,595	9,297
Effect of discount rate assumptions	(1,378)	(392)
Ending balance	9,217	8,905	8,945	9,794
Liability for future policy benefits	399	455
Other	202	226
Future policy benefits	601	681	587
Undiscounted expected future gross premiums	17,600	13,500
Discounted expected future gross premiums	12,500	10,700
Undiscounted expected future policy benefits	12,800	11,200
Future policy benefit reserve, reinsurance recoverable	154	171
Other Operations
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits	3,631		3,592
Undiscounted expected future policy benefits	4,600	4,700
Future policy benefit reserve, reinsurance recoverable	1,000	1,200
Future policy benefits, DPL	392	384
Future policy benefit, excluding DPL	$ 3,200	3,900	$ 3,200	4,300
Future policy benefits classified as liabilities of business held for sale		$ 3,700		$ 3,800