Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) $ in Millions |
Mar. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
|---|---|---|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Estimated fair value | $ 44,079 | $ 43,692 |
| Fixed maturity securities | Discounted cash flow | ||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Estimated fair value | $ 1,805 | $ 1,724 |
| Credit spread | Discounted cash flow | Minimum | ||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Debt securities, available-for-sale, measurement Input | 0.01 | 0.01 |
| Credit spread | Discounted cash flow | Maximum | ||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Debt securities, available-for-sale, measurement Input | 0.07 | 0.06 |
| Credit spread | Discounted cash flow | Weighted Average | ||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Debt securities, available-for-sale, measurement Input | 0.02 | 0.02 |