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v3.25.3

Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 102,786 | [1] |  |  | $ 102,786 | [1] |  |  |  |  | $ 80,121 | [2] |  |  |  |
Valuation, Income Approach [Member] | Other Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 3 |  |  |  | 3 |  |  |  |  |  | 2 |  |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 9,737 |  | $ 6,143 |  | 9,737 |  | $ 6,143 |  | $ 8,912 |  | 6,854 |  | $ 5,501 |  | $ 4,933 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 3 |  | 149 |  | 102 |  | 132 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,156 | [3] | 809 | [3] | 3,559 | [4] | 2,001 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (87) | [3] | (96) | [3] | (178) | [4] | (278) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (253) | [3] | (196) | [3] | (575) | [4] | (546) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 20 |  | 0 |  | 22 |  | 1 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | (20) |  | (9) |  | (54) |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 3 |  | 4 |  | 10 |  | 10 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 2 |  | 3 |  | 8 |  | 6 |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | (17) |  | (8) |  | (48) |  | (56) |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | (17) |  | (11) |  | (49) |  | (56) |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 7 |  | 150 |  | 108 |  | 135 |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 649 |  |  |  | $ 649 |  |  |  |  |  | $ 99 |  |  |  |  |
Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.03 |  |  |  | 0.03 |  |  |  |  |  |  |  |  |  |  |
Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.04 |  |  |  | 0.04 |  |  |  |  |  | 2 |  |  |  |  |
Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.02 |  |  |  | 0.02 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 1,026 |  |  |  | $ 1,026 |  |  |  |  |  | $ 564 |  |  |  |  |
Asset-backed Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.03 |  |  |  | 0.03 |  |  |  |  |  | 0.03 |  |  |  |  |
Asset-backed Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.20 |  |  |  | 0.20 |  |  |  |  |  | 0.10 |  |  |  |  |
Asset-backed Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 4 |  |  |  | $ 4 |  |  |  |  |  | $ 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 4 |  | 6 |  | 4 |  | 6 |  | 4 |  | $ 5 |  | 27 |  | 26 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [3] | 0 | [3] | (1) | [4] | (1) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  | 0 |  | 2 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | (21) |  | 0 |  | (21) |  |  |  |  |  |  |  |  |
US Government Agencies Debt Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
US Government Agencies Debt Securities [Member] | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
US Government Agencies Debt Securities [Member] | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
US Government Agencies Debt Securities [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 0 |  | 0 |  | $ 0 |  | 0 |  |  |  |  |  |  |  |  |
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 1 |  |  |  | 1 |  |  |  |  |  | 0 |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 94 |  | 82 |  | $ 94 |  | 82 |  | 91 |  | $ 88 |  | 74 |  | 70 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2 | [3] | 6 | [3] | 2 | [4] | 17 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [3] | (1) | [3] | (1) | [4] | (1) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Equity securities | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Equity securities | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 1 |  | 3 |  | 5 |  | (4) |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 1 |  | 2 |  | 6 |  | (5) |  |  |  |  |  |  |  |  |
Equity securities | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Equity securities | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Equity securities | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 36 |  |  |  | $ 36 |  |  |  |  |  | $ 33 |  |  |  |  |
Equity securities | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.04 |  |  |  | 0.04 |  |  |  |  |  | 4 |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | $ 9 |  |  |  | $ 9 |  |  |  |  |  | $ 22 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | (96) | [5] | (180) | [5],[6] | (96) | [5] | (180) | [5],[6] | (63) | [5] | (55) | [5] | (68) | [6] | (171) | [5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | [5] | 0 | [6] | 0 | [5] | 0 | [5] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [3],[5] | 0 | [3],[6] | 0 | [4],[5] | 0 | [4],[5] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [3],[5] | 0 | [3],[6] | 0 | [4],[5] | 0 | [4],[5] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [3],[5] | 0 | [3],[6] | 0 | [4],[5] | 0 | [4],[5] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | [5] | 0 | [6] | 0 | [5] | 0 | [5] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | [5] | 0 | [6] | 0 | [5] | 0 | [5] |  |  |  |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 | [5] | 0 | [6] | 0 | [5] | 0 | [5] |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | [5] | 0 | [6] | 0 | [4] | 0 | [5] |  |  |  |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | (33) | [5] | (112) | [6] | (41) | [5] | (9) | [5] |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | (33) | [5] | (112) | [6] | (41) | [4] | (9) | [5] |  |  |  |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 | [5] | 0 | [6] | 0 | [5] | 0 | [5] |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | [5] | 0 | [6] | 0 | [4] | 0 | [5] |  |  |  |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | [5] | 0 | [6] | 0 | [4] | 0 | [5] |  |  |  |  |  |  |  |
Embedded Derivatives In Indexed Annuity [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 438 |  |  |  | $ 438 |  |  |  |  |  | $ 435 |  |  |  |  |
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.02 |  |  |  | 0.02 |  |  |  |  |  | 0.02 |  |  |  |  |
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.08 |  |  |  | 0.08 |  |  |  |  |  | 0.04 |  |  |  |  |
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0.01 |  |  |  |  |
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 25 |  | 11 |  | $ 25 |  | 11 |  | 9 |  | $ 11 |  | 15 |  | 2 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 17 | [3] | 3 | [3] | 24 | [4] | 12 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [3] | 0 | [3] | 0 | [4] | (1) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [3] | 0 | [3] | (7) | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (1) |  | 0 |  | (3) |  | (1) |  |  |  |  |  |  |  |  |
Short-term Investments [Member] | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Short-term Investments [Member] | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | (1) |  | 0 |  | (1) |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | (1) |  | 0 |  | (1) |  |  |  |  |  |  |  |  |
Short-term Investments [Member] | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Short-term Investments [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Total Return Swap | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | 4 |  |  |  | 4 |  |  |  |  |  | 2 |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 1 |  | 0 |  | 1 |  | 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [3] | 0 | [3] | 0 | [4] | 0 | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Derivatives | Investment Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Derivatives | Investment Related Gains Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 1 |  | 0 |  | 1 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | (1) |  | 0 |  | (1) |  | 0 |  |  |  |  |  |  |  |  |
Derivatives | Interest Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Derivatives | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.02 |  |  |  | 0.02 |  |  |  |  |  | 0.02 |  |  |  |  |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.08 |  |  |  | 0.08 |  |  |  |  |  | 0.04 |  |  |  |  |
Measurement Input Crediting Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0.01 |  |  |  |  |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.05 |  |  |  | 0.05 |  |  |  |  |  | 0.05 |  |  |  |  |
Measurement Input, Counterparty Credit Risk [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.05 |  |  |  | 0.05 |  |  |  |  |  | 0.04 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.10 |  |  |  | 0.10 |  |  |  |  |  | 0.10 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.04 |  |  |  | 0.04 |  |  |  |  |  | 0.04 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.10 |  |  |  | 0.10 |  |  |  |  |  | 0.10 |  |  |  |  |
Measurement Input, Withdrawal Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.19 |  |  |  | 0.19 |  |  |  |  |  | 0.18 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.35 |  |  |  | 0.35 |  |  |  |  |  | 0.35 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.18 |  |  |  | 0.18 |  |  |  |  |  | 0.17 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.35 |  |  |  | 0.35 |  |  |  |  |  | 0.35 |  |  |  |  |
Measurement Input, Lapse Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0.04 |  |  |  | 0.04 |  |  |  |  |  | 0.03 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 1 |  |  |  | 1 |  |  |  |  |  | 1 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0.03 |  |  |  | 0.03 |  |  |  |  |  | 0.03 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 1 |  |  |  | 1 |  |  |  |  |  | 1 |  |  |  |  |
Measurement Input, Mortality Rate [Member] | Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 10.5 |  |  |  | 10.5 |  |  |  |  |  | 9.7 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 14.8 |  |  |  | 14.8 |  |  |  |  |  | 11.0 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Corporate Debt Securities [Member] | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 6.1 |  |  |  | 6.1 |  |  |  |  |  | 6.7 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Weighted Average [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input | 9.9 |  |  |  | 9.9 |  |  |  |  |  | 10.9 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Maximum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input | 13.3 |  |  |  | 13.3 |  |  |  |  |  | 12.8 |  |  |  |  |
Measurement Input, EBITDA Multiple [Member] | Equity securities | Minimum [Member] | Valuation, Market Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input | 7.4 |  |  |  | 7.4 |  |  |  |  |  | 7.4 |  |  |  |  |
Measurement Input, Credit Spread | Other Assets | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Credit Spread | Other Assets | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0.01 |  |  |  |  |
Measurement Input, Credit Spread | Other Assets | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Credit Spread | Other Liabilities | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Credit Spread | Other Liabilities | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0.01 |  |  |  |  |
Measurement Input, Credit Spread | Other Liabilities | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Default Rate | Other Assets | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Default Rate | Other Assets | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0.07 |  |  |  | 0.07 |  |  |  |  |  | 0.08 |  |  |  |  |
Measurement Input, Default Rate | Other Assets | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Default Rate | Other Liabilities | Weighted Average [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0.01 |  |  |  | 0.01 |  |  |  |  |  | 0 |  |  |  |  |
Measurement Input, Default Rate | Other Liabilities | Maximum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0.07 |  |  |  | 0.07 |  |  |  |  |  | 0.08 |  |  |  |  |
Measurement Input, Default Rate | Other Liabilities | Minimum [Member] | Valuation, Income Approach [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Measurement Input | 0 |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of September 30, 2025, the fair value of such investments was $940 million.
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2024, the fair value of such investments was $966 million
[3] | The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
For the nine months ended September 30, 2024: |  | Fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  |  |  | Funds withheld at interest –embedded derivatives, net (1) |  | Funds withheld at interest |  |  |  | Interest-sensitive contract liabilities – embedded derivatives
|  | Corporate |  | Foreign govt |  | Structured securities |  | U.S. and local govt |  | Equity securities |  |  |  |  | Short-term investments |  | Derivatives, net |  |  |  |
Fair value, beginning of period |  | $ | 4,933 |  |  | $ | 35 |  |  | $ | 1,425 |  |  | $ | 26 |  |  | $ | 70 |  |  |  |  |  | $ | 2 |  |  | $ | — |  |  | $ | (171) |  |  | $ | 54 |  |  |  |  | $ | (415) |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | 10 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  |  |  | — |
Investment related gains (losses), net |  | (56) |  |  | — |  |  | (1) |  |  | — |  |  | (4) |  |  |  |  |  | (1) |  |  | — |  |  | (9) |  |  | — |  |  |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | (27) |
Included in other comprehensive income (loss) |  | 132 |  |  | (1) |  |  | 30 |  |  | — |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  |  |  | — |
Purchases (2) |  | 2,001 |  |  | — |  |  | 287 |  |  | — |  |  | 17 |  |  |  |  |  | 12 |  |  | — |  |  | — |  |  | 2 |  |  |  |  | (18) |
Sales (2) |  | (278) |  |  | — |  |  | (23) |  |  | — |  |  | (1) |  |  |  |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Settlements (2) |  | (546) |  |  | — |  |  | (260) |  |  | (1) |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | (3) |  |  |  |  | 75 |
Transfers into Level 3 |  | 1 |  |  | — |  |  | 117 |  |  | 2 |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Transfers out of Level 3 |  | (54) |  |  | — |  |  | (22) |  |  | (21) |  |  | — |  |  |  |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Fair value, end of period |  | $ | 6,143 |  |  | $ | 34 |  |  | $ | 1,556 |  |  | $ | 6 |  |  | $ | 82 |  |  |  |  |  | $ | 11 |  |  | $ | — |  |  | $ | (180) |  |  | $ | 60 |  |  |  |  | $ | (385) |
Total gains/losses (realized/unrealized) recorded for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | $ | 6 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |  |  |  |  | $ | — |
Investment related gains (losses), net |  | (56) |  |  | — |  |  | (3) |  |  | — |  |  | (5) |  |  |  |  |  | (1) |  |  | — |  |  | (9) |  |  | — |  |  |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | (103) |
Included in other comprehensive income (loss) |  | 135 |  |  | (1) |  |  | 32 |  |  | — |  |  | — |  |  |  |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  |  |  | — |
(1)Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward. (2)The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
[4] | The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
[5] | Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward.
[6] | Funds withheld at interest – embedded derivative assets and liabilities are presented net for purposes of the rollforward.

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