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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 (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | $ 7 | $ 3
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 | $ 7 | $ 3
Total included in net income | 7 | 3
Changes in unrealized net capital gains and losses reported in OCI | $ 2 | $ 1
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 | $ 0 | $ (5)
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 | $ 5 | $ (1)
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 | $ 2 | $ 9
Corporate - privately placed |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | (4) | (4)
Fixed income securities |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | (4) | (4)
Equity securities |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | 9 | (1)
Other investments |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | 0 | (1)
Other assets |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Total recurring Level 3 assets | 2 | 9
Corporate - public |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Changes in unrealized net capital gains and losses reported in OCI | $ 2 | $ 1

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