Insurance and Contractholder Liabilities - Future Policy Benefits - Present Values of Expected Premiums and Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Cigna Healthcare
Insurance and Contractholder Liabilities [Line Items]
Liability for Future Policy Benefit, Expected Net Premium, Period Increase (Decrease)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Period Increase (Decrease)
Other Operations
Insurance and Contractholder Liabilities [Line Items]
Deferred profit liability included in future policy benefits	359	379
Future policy benefit, excluding deferred profit liability	3,000	3,100	$ 2,900	$ 3,200
Undiscounted expected future policy benefits	4,300	4,400
Future policy benefits reserve, reinsurance recoverables	$ 900	$ 1,000