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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale | [1] | $ 62,333 | $ 65,242
Obligations of states, municipalities and political subdivisions |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 4,492 | $ 4,833
Obligations of states, municipalities and political subdivisions | Minimum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0509 | 0.0500
Obligations of states, municipalities and political subdivisions | Maximum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0547 | 0.0550
Obligations of states, municipalities and political subdivisions | Weighted-average | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0528 | 0.0523
Obligations of states, municipalities and political subdivisions | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 4 | $ 3
Corporate debt |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 30,787 | $ 32,346
Corporate debt | Minimum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0569 | 0.0516
Corporate debt | Maximum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.1038 | 0.0962
Corporate debt | Weighted-average | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0804 | 0.0739
Corporate debt | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 306 | $ 332
RMBS |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 5,778 | $ 6,207
RMBS | Minimum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0630 | 0.0618
RMBS | Minimum | Constant prepayment rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0458 | 0.0443
RMBS | Minimum | Loss severity |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.4173 | 0.4321
RMBS | Minimum | Constant default rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0077 | 0.0082
RMBS | Maximum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0761 | 0.0742
RMBS | Maximum | Constant prepayment rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.1068 | 0.1030
RMBS | Maximum | Loss severity |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.7679 | 0.7665
RMBS | Maximum | Constant default rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0262 | 0.0264
RMBS | Weighted-average | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0696 | 0.0680
RMBS | Weighted-average | Constant prepayment rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0763 | 0.0736
RMBS | Weighted-average | Loss severity |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.5926 | 0.5993
RMBS | Weighted-average | Constant default rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0170 | 0.0173
RMBS | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 1,268 | $ 1,341
CLO/ABS | Minimum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0547 | 0.0531
CLO/ABS | Maximum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0882 | 0.0856
CLO/ABS | Weighted-average | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0715 | 0.0694
CLO/ABS | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 1,163 | $ 1,100
CMBS |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 4,287 | $ 4,147
CMBS | Minimum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.0722 | 0.0984
CMBS | Maximum | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.1519 | 0.1724
CMBS | Weighted-average | Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative asset, measurement input |  | 0.1120 | 0.1354
CMBS | Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Bonds available for sale |  | $ 14 | $ 22
[1] | See Note 10 for details of balances associated with variable interest entities.

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