Insurance and Contractholder Liabilities - Unpaid Claims and Claims Expenses - Cigna Healthcare - Incurred and Paid Claims Development and Unpaid Claims Liability (Details) - Cigna Healthcare claim in Millions, $ in Millions	Dec. 31, 2022 USD ($) claim	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Claims Development [Line Items]
Incurred Costs	$ 60,802
Unpaid Claims & Claim Expenses	3,802
Cumulative Costs Paid	57,000
Outstanding liabilities for the periods presented, net of reinsurance	3,802
Other long-duration liabilities not included in development table above	153
Net unpaid claims and claims expenses - U.S. Medical	3,955	$ 4,000	$ 3,458	$ 3,018
Reinsurance and other amounts recoverable	221	261	237	318
Unpaid claims and claim expenses - U.S. Medical	$ 4,176	4,261	$ 3,695	$ 3,336
Percent of health claims paid within one year	95.00%
Incurral Year - 2021
Claims Development [Line Items]
Incurred Costs	$ 30,493	30,735
Unpaid Claims & Claim Expenses	180
Cumulative Costs Paid	30,313	$ 27,039
Outstanding liabilities for the periods presented, net of reinsurance	$ 180
Claims Frequency | claim	5
Incurral Year - 2022
Claims Development [Line Items]
Incurred Costs	$ 30,309
Unpaid Claims & Claim Expenses	3,622
Cumulative Costs Paid	26,687
Outstanding liabilities for the periods presented, net of reinsurance	$ 3,622
Claims Frequency | claim	5