Insurance and Contractholder Liabilities - Future Policy Benefits - Present Values of Expected Premiums and Benefits (Details) - USD ($) $ in Billions |
9 Months Ended | |||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Cigna Healthcare | ||||
| Insurance and Contractholder Liabilities [Line Items] | ||||
| Liability for Future Policy Benefit, Expected Net Premium, Period Increase (Decrease) | ||||
| Liability for Future Policy Benefit, Expected Future Policy Benefit, Period Increase (Decrease) | ||||
| Other Operations | ||||
| Insurance and Contractholder Liabilities [Line Items] | ||||
| Deferred profit liability included in future policy benefits | 0.4 | 0.4 | ||
| Future policy benefit, excluding deferred profit liability | 2.9 | 3.1 | $ 2.9 | $ 3.2 |
| Undiscounted expected future policy benefits | 4.2 | 4.3 | ||
| Future policy benefits reserve, reinsurance recoverables | $ 0.9 | $ 0.9 | ||