Insurance and Contractholder Liabilities - Unpaid Claims and Claims Expenses - Cigna Healthcare - Variances in Incurred Costs Related to Prior Years' Unpaid Claims and Claims Expenses (Details) - Cigna Healthcare - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 268 | $ 297 |
| Favorable (unfavorable) variance, percentage | 0.80% | 0.80% |
| Actual completion factors and other | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 144 | $ 170 |
| Favorable (unfavorable) variance, percentage | 0.40% | 0.50% |
| Medical cost trend | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 124 | $ 127 |
| Favorable (unfavorable) variance, percentage | 0.40% | 0.30% |