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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 1,924 | $ 3,311 |  |
Separate accounts liabilities | 1,924 | 3,311 | $ 3,271 | $ 3,250
Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,899 | 3,499 |  |
Recurring | Other Receivables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 25 |  |  |
Recurring | Other Payables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts liabilities |  | 188 |  |
Recurring | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 160 | 165 |  |
Recurring | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 396 | 856 |  |
Recurring | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,343 | 2,478 |  |
Recurring | Level 1 |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 22 | 187 |  |
Recurring | Level 1 | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 2 | 1 |  |
Recurring | Level 1 | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 20 | 186 |  |
Recurring | Level 1 | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 0 | 0 |  |
Recurring | Level 2 |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,876 | 3,311 |  |
Recurring | Level 2 | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 158 | 164 |  |
Recurring | Level 2 | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 375 | 669 |  |
Recurring | Level 2 | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,343 | 2,478 |  |
Recurring | Level 3 |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1 | 1 |  |
Recurring | Level 3 | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 0 | 0 |  |
Recurring | Level 3 | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1 | 1 |  |
Recurring | Level 3 | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 0 | $ 0 |  |

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