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Fair Value of Assets and Liabilities - Schedule of Valuation Changes Included in Net Income and OCI for Level 3 Assets and Liabilities Held (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | $ 14 | $ 7
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag | Total included in net income | Total included in net income
Total included in net income | $ 14 | $ 7
Total included in net income | 14 | 7
Changes in unrealized net capital gains and losses reported in OCI | $ 1 | $ 2
Net investment income |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income | Net investment income
Total included in net income | $ 14 | $ 0
Net gains (losses) on investments and derivatives |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net gains (losses) on investments and derivatives | Net gains (losses) on investments and derivatives
Total included in net income | $ 0 | $ 5
Operating costs and expenses |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs and expenses | Operating costs and expenses
Total included in net income | $ 0 | $ 2
Fixed income securities |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | (1) | (4)
Corporate - public |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | (1) | 0
Changes in unrealized net capital gains and losses reported in OCI | 1 | 2
Corporate - privately placed |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | 0 | (4)
Equity securities |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | 15 | 9
Other assets |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | $ 0 | $ 2

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