Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | $ 168,438 | $ 158,257 |
| Mutual funds and collective investment trusts | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 167,759 | 157,578 |
| Exchange-traded funds | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 336 | 350 |
| Fixed maturity AFS securities | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 161 | 167 |
| Cash and invested cash | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 12 | 25 |
| Other investments | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | $ 170 | $ 137 |