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 |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 226 | $ 144 |
| Favorable (unfavorable) variance, percentage | 0.60% | 0.50% |
| Actual completion factors | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 76 | $ 1 |
| Favorable (unfavorable) variance, percentage | 0.20% | 0.00% |
| Medical cost trend | ||
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] | ||
| Favorable (unfavorable) variance, amount | $ 150 | $ 143 |
| Favorable (unfavorable) variance, percentage | 0.40% | 0.50% |