Insurance and Contractholder Liabilities - Unpaid Claims and Claims Expenses - Cigna Healthcare - Summary of Incurred and Paid Claims Development, Claims Frequency Metrics and Incurred but Not Yet Reported Liabilities (Details) - Cigna Healthcare claim in Millions, $ in Millions	Dec. 31, 2021 USD ($) claim	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Claims Development [Line Items]
Incurred Costs	$ 57,067
Unpaid Claims & Claim Expenses	3,852
Cumulative Costs Paid	53,215
Outstanding liabilities for the periods presented, net of reinsurance	3,852
Other long-duration liabilities not included in development table above	148
Net unpaid claims and claims expenses - U.S. Medical	4,000	$ 3,458	$ 3,018	$ 2,810
Reinsurance and other amounts recoverable	261	237	318	280
Unpaid claims and claim expenses - U.S. Medical	4,261	3,695	$ 3,336	$ 3,090
Incurral Year - 2020
Claims Development [Line Items]
Incurred Costs	26,332	26,532
Unpaid Claims & Claim Expenses	$ 156
Claims Frequency | claim	4.7
Cumulative Costs Paid	$ 26,176	$ 23,347
Outstanding liabilities for the periods presented, net of reinsurance	156
Incurral Year - 2021
Claims Development [Line Items]
Incurred Costs	30,735
Unpaid Claims & Claim Expenses	$ 3,696
Claims Frequency | claim	5.1
Cumulative Costs Paid	$ 27,039
Outstanding liabilities for the periods presented, net of reinsurance	$ 3,696