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 |
9 Months Ended | |
|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 319 | $ 422 |
| Favorable (unfavorable) variance, percentage | 0.80% | 1.20% |
| Actual completion factors and other | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 185 | $ 212 |
| Favorable (unfavorable) variance, percentage | 0.50% | 0.60% |
| Medical cost trend | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 134 | $ 210 |
| Favorable (unfavorable) variance, percentage | 0.30% | 0.60% |