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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 71,184 | $ 64,006
Obligations of states, municipalities and political subdivisions |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 2,889 | $ 3,143
Obligations of states, municipalities and political subdivisions | Minimum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0525 | 0.0509
Obligations of states, municipalities and political subdivisions | Maximum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0558 | 0.0557
Obligations of states, municipalities and political subdivisions | Weighted-average | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0541 | 0.0533
Obligations of states, municipalities and political subdivisions | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 3 | $ 3
Corporate debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 36,951 | $ 31,826
Corporate debt | Minimum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0860 | 0.0683
Corporate debt | Maximum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.1676 | 0.1161
Corporate debt | Weighted-average | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.1363 | 0.0922
Corporate debt | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 20 | $ 177
RMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 10,303 | $ 8,604
RMBS | Minimum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0520 | 0.0589
RMBS | Minimum | Constant prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0405 | 0.0410
RMBS | Minimum | Loss severity |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.3950 | 0.4081
RMBS | Minimum | Constant default rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0054 | 0.0057
RMBS | Maximum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0594 | 0.0698
RMBS | Maximum | Constant prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0751 | 0.0926
RMBS | Maximum | Loss severity |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.7931 | 0.7672
RMBS | Maximum | Constant default rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0196 | 0.0248
RMBS | Weighted-average | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0557 | 0.0644
RMBS | Weighted-average | Constant prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0578 | 0.0668
RMBS | Weighted-average | Loss severity |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.5941 | 0.5876
RMBS | Weighted-average | Constant default rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0125 | 0.0152
RMBS | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 1,197 | $ 1,321
CLO/ABS | Minimum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0239 | 0.0424
CLO/ABS | Maximum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0954 | 0.0842
CLO/ABS | Weighted-average | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0588 | 0.0633
CLO/ABS | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 1,053 | $ 760
CMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 4,190 | $ 3,926
CMBS | Minimum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0556 | 0.0704
CMBS | Maximum | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.1335 | 0.1012
CMBS | Weighted-average | Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset, measurement input | 0.0878 | 0.0870
CMBS | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Bonds available for sale | $ 5 | $ 25

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