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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 3,200 | $ 3,228 |  |
Separate accounts liabilities | 3,200 | 3,228 | $ 3,318 | $ 5,087
Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 3,159 | 3,313 |  |
Recurring | Other Receivables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 41 |  |  |
Recurring | Other Payables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts liabilities |  | 85 |  |
Recurring | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 153 | 156 |  |
Recurring | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 2,563 | 2,677 |  |
Recurring | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 443 | 480 |  |
Recurring | Level 1 |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 668 | 714 |  |
Recurring | Level 1 | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1 | 2 |  |
Recurring | Level 1 | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 667 | 712 |  |
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 | 2,491 | 2,599 |  |
Recurring | Level 2 | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 152 | 154 |  |
Recurring | Level 2 | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,896 | 1,965 |  |
Recurring | Level 2 | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 443 | 480 |  |
Recurring | Level 3 |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 0 | 0 |  |
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 | 0 | 0 |  |
Recurring | Level 3 | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 0 | $ 0 |  |

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