Insurance and Contractholder Liabilities - Unpaid Claims and Claim Expenses - Cigna Healthcare - Activity (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2024
Held-for-Sale \| Medicare Advantage and related Cigna Healthcare businesses
Paid costs related to:
Unpaid claims classified as liabilities of business held for sale			$ 983
Cigna Healthcare
Liability for Claims and Claims Adjustment Expense [Line Items]
Total of incurred but not reported liabilities plus expected claim development on reported claims and reported claims in process	$ 5,000	$ 4,500
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Beginning balance	4,241
Less: Reinsurance and other amounts recoverable	147
Beginning balance, net	4,094
Beginning balance, including held for sale liabilities		5,018
Less: Reinsurance, including held for sale liabilities		159
Beginning balance, net, including held for sale liabilities		4,859
Incurred costs related to:
Current year	16,093	18,163
Prior years	(268)	(297)
Total incurred	15,825	17,866
Paid costs related to:
Current year	11,576	13,019
Prior years	3,258	3,889
Total paid	14,834	16,908
Less: Divestiture and other	0	1,323
Ending balance, net	5,085	4,494
Add: Reinsurance and other amounts recoverable	143	142
Ending balance	$ 5,228	$ 4,636

Represents the total liability for incurred but not reported claims plus expected claim development on reported claims, including reported claims in process. Excludes amounts due for physician incentives and other medical care expenses and services payable.

No definition available.