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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | $ 3,228 | $ 5,087 |
Separate accounts liabilities | (3,228) | (5,087) | $ (4,881)
Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 3,313 | 5,017 |
Recurring | Other payables |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts liabilities | (85) |  |
Recurring | Other receivables |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets |  | 70 |
Recurring | Cash and cash equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 156 | 188 |
Recurring | Debt securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 2,677 | 4,281 |
Recurring | Equity securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 0 | 1 |
Recurring | Common/collective trusts |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 480 | 547 |
Recurring | Level 1 |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 714 | 1,235 |
Recurring | Level 1 | Cash and cash equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 2 | 2 |
Recurring | Level 1 | Debt securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 712 | 1,233 |
Recurring | Level 1 | Equity securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 0 | 0 |
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 | 2,599 | 3,782 |
Recurring | Level 2 | Cash and cash equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 154 | 186 |
Recurring | Level 2 | Debt securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 1,965 | 3,048 |
Recurring | Level 2 | Equity securities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 0 | 1 |
Recurring | Level 2 | Common/collective trusts |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 480 | 547 |
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 | Equity 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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