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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | $ 12 | $ 24 | $ 21 | $ 19
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 | Total included in net income
Total included in net income | $ 12 | $ 24 | $ 21 | $ 19
Total included in net income | 12 | 24 | 21 | 19
Changes in unrealized net capital gains and losses reported in OCI | $ 0 | $ (2) | $ 1 | $ 0
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 | Net investment income | Net investment income
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income | Net investment income | Net investment income | Net investment income
Total included in net income | $ 0 | $ (1) | $ 1 | $ (3)
Net gains (losses) on investments and derivatives |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total included in net income | $ 10 | $ 16 | $ 15 | $ 12
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 | Operating costs and expenses | Operating costs and expenses
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Operating costs and expenses | Operating costs and expenses | Operating costs and expenses | Operating costs and expenses
Total included in net income | $ 2 | $ 9 | $ 5 | $ 10
Municipal |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | (2) | 0 | (2) | 0
Corporate - public |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | 0 | 0 | 1 | 0
Changes in unrealized net capital gains and losses reported in OCI | 0 | (1) | 1 | 0
Corporate - privately placed |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | 0 | 0 | (6) | (11)
Changes in unrealized net capital gains and losses reported in OCI | 0 | (1) | 0 | 0
Fixed income securities |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | (2) | 0 | (7) | (11)
Equity securities |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | 12 | 15 | 23 | 21
Other investments |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | 0 | 0 | 0 | (1)
Other assets |  |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |  |
Total recurring Level 3 assets | $ 2 | $ 9 | $ 5 | $ 10

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