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Fair Value Hierarchy - Amount of Level 3 Investments and Significant Unobservable Inputs Used to Value Such Investments (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
yr
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
yr
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ $ 965,610 $ 967,846 $ 907,669
Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ 21,781 $ 21,117 20,358
Corporate debt securities | Level 3 | Investments      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ $ 4,539   $ 4,510
Corporate debt securities | Level 3 | Yield | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 6.00%   5.00%
Corporate debt securities | Level 3 | Yield | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 37.50%   28.80%
Corporate debt securities | Level 3 | Yield | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 11.00%   12.20%
Corporate debt securities | Level 3 | Recovery rate | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 8.60%   5.80%
Corporate debt securities | Level 3 | Recovery rate | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 82.30%   41.00%
Corporate debt securities | Level 3 | Recovery rate | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 70.30%   25.20%
Corporate debt securities | Level 3 | Duration (years) | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 1.0   0.3
Corporate debt securities | Level 3 | Duration (years) | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 8.3   9.0
Corporate debt securities | Level 3 | Duration (years) | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 3.8   3.6
Corporate debt securities | Level 3 | Multiples | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 1   1.1
Corporate debt securities | Level 3 | Multiples | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 42.9   34.2
Corporate debt securities | Level 3 | Multiples | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 6.9   6.5
Securities backed by real estate | Level 3 | Investments      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ $ 405   $ 562
Securities backed by real estate | Level 3 | Yield | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 9.20%   9.50%
Securities backed by real estate | Level 3 | Yield | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 17.00%   16.00%
Securities backed by real estate | Level 3 | Yield | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 15.70%   13.60%
Securities backed by real estate | Level 3 | Duration (years) | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 2.3   1.1
Securities backed by real estate | Level 3 | Duration (years) | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 2.3   2.8
Securities backed by real estate | Level 3 | Duration (years) | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input | yr 2.3   2.8
Other debt obligations | Level 3 | Investments      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ $ 346   $ 328
Other debt obligations | Level 3 | Yield | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 5.10%   7.00%
Other debt obligations | Level 3 | Yield | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 7.60%   8.70%
Other debt obligations | Level 3 | Yield | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 7.00%   7.70%
Equity securities | Level 3 | Investments      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total financial assets at fair value | $ $ 9,712   $ 8,742
Equity securities | Level 3 | Multiples | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 0.4   0.4
Equity securities | Level 3 | Multiples | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 24.4   34.2
Equity securities | Level 3 | Multiples | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments, measurement input 8.7   8.6
Equity securities | Level 3 | Discount rate/yield | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 4.40%   6.00%
Equity securities | Level 3 | Discount rate/yield | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 25.00%   27.90%
Equity securities | Level 3 | Discount rate/yield | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 11.90%   13.30%
Equity securities | Level 3 | Capitalization rate | Investments | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 2.90%   4.40%
Equity securities | Level 3 | Capitalization rate | Investments | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 9.10%   9.10%
Equity securities | Level 3 | Capitalization rate | Investments | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of investments, measurement input 5.30%   5.40%