Insurance and Contractholder Liabilities - Account Balances (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Current
Market risk benefits, current	$ 30	$ 25
Unearned premiums, current	793
Current insurance and contractholder liabilities	5,984	5,388
Non-current
Market risk benefits, non-current	800	760
Unearned premiums, non-current	45
Non-current insurance and contractholder liabilities	10,309	10,254
Total
Market risk benefits	830	785	$ 891
Unearned premiums	838
Total insurance and contractholder liabilities	16,293	15,642	16,429
Cigna Healthcare
Current
Unpaid claims and claim expenses, current	4,452
Future policy benefits, current	38
Contractholder deposit funds, current	0
Non-current
Unpaid claims and claim expenses, non-current	56
Future policy benefits, non-current	154
Contractholder deposit funds, non-current	0
Total
Unpaid claims and claim expenses	4,508
Total liability for future policy benefits	192
Contractholder deposit funds	0
Other
Current
Unpaid claims and claim expenses, current	172	147
Non-current
Unpaid claims and claim expenses, non-current	194	144
Total
Unpaid claims and claim expenses	366	291	260
Other Operations
Current
Future policy benefits, current	151	157
Contractholder deposit funds, current	348	366
Non-current
Future policy benefits, non-current	3,157	3,140
Contractholder deposit funds, non-current	5,903	5,958
Total
Total liability for future policy benefits	3,308	3,297	3,460
Contractholder deposit funds	$ 6,251	$ 6,324	$ 6,452	$ 6,500