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Fair Value Hierarchy - Summary of Weighted Average of Significant Unobservable Inputs, Loans (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
yr
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
yr
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value $ 5,498   $ 5,460
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 671 $ 681 683
Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 430   467
Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 391   403
Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 102   117
Other collateralized      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 1,149   783
Other collateralized | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 155   135
Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value 51   60
Other | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans at fair value $ 23   $ 28
Minimum | Yield | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.064   0.116
Minimum | Yield | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input     0.061
Minimum | Yield | Other collateralized | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.058   0.062
Minimum | Recovery rate | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.323   0.372
Minimum | Recovery rate | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.690   0.033
Minimum | Duration (years) | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr 2.9   0.6
Minimum | Duration (years) | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr     0.2
Maximum | Yield | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.178   0.224
Maximum | Yield | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input     0.109
Maximum | Yield | Other collateralized | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.065   0.068
Maximum | Recovery rate | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.952   0.956
Maximum | Recovery rate | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.992   0.992
Maximum | Duration (years) | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr 4.6   9.3
Maximum | Duration (years) | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr     3.6
Weighted Average | Yield | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.152   0.175
Weighted Average | Yield | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input     0.067
Weighted Average | Yield | Other collateralized | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.058   0.063
Weighted Average | Recovery rate | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.582   0.729
Weighted Average | Recovery rate | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.748   0.737
Weighted Average | Duration (years) | Corporate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr 3.5   6.0
Weighted Average | Duration (years) | Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | yr     0.6