Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Consolidated effective tax rate	368.40%	18.40%
Deferred tax assets associated with unrealized investment losses	$ 664
Valuation allowance of deferred tax assets associated with unrealized investment losses	$ 427

Deferred tax assets relative to investments subject to Federal capital loss utilization rules. Capital losses can only be utilized to extent there are capital gains in a given year. If capital losses exceed capital gains, the taxpayer can utilize capital losses to the extent there are capital gains in the applicable carryback period.

No definition available.

Name:	ci_DeferredTaxAssetsInvestmentsSubjectToFederalCapitalLossUtilizationRules
Namespace Prefix:	ci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant