Insurance and Contractholder Liabilities - Future Policy Benefits - Present Values of Expected Premiums and Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cigna Healthcare
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	$ 9,233	$ 8,557
Reversal of effect of beginning of period discount rate assumptions	1,154	1,537
Effect of assumption changes and actual variances from expected experience		5	$ 314
Issuances and lapses	1,982	1,255
Net premiums collected	(1,441)	(1,370)
Interest and other	752	94
Ending balance at original discount rate	11,685	10,387
Effect of end of period discount rate assumptions	(1,232)	(1,154)
Ending balance	10,453	9,233	8,557
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	9,633	8,945
Reversal of effect of discount rate assumptions	1,220	1,611
Effect of assumption changes and actual variances from expected experience (2)		204	112
Issuances and lapses	1,893	1,309
Benefit payments	(1,473)	(1,374)
Interest and other	668	250
Ending balance at original discount rate	12,145	10,853
Effect of discount rate assumptions	(1,309)	(1,220)
Ending balance	10,836	9,633	8,945
Liability for future policy benefits	383	400
Other	215	215
Total liability for future policy benefits, including assets held for sale	598	615
Effect of actual variances from expectations	(44)	(12)
Undiscounted expected future gross premiums	21,400	18,700
Discounted expected future gross premiums	14,300	13,500
Undiscounted expected future policy benefits	16,100	13,300
Cigna Healthcare | Reinsurance recoverables
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits reserve, reinsurance recoverables	85	72
Cigna Healthcare | Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits classified as liabilities of business held for sale	408	429
Cigna Healthcare | Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses | Assets of businesses held for sale
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future policy benefits reserve, reinsurance recoverables	80	79
Other Operations
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Total liability for future policy benefits	3,297	3,538
Undiscounted expected future policy benefits	4,300	4,500
Future policy benefits reserve, reinsurance recoverables	900	1,000
Deferred profit liability included in future policy benefits	366	384
Future policy benefit, excluding deferred profit liability	$ 2,900	$ 3,200	$ 3,200