v3.25.4
Fair Value Hierarchy - Summary of Weighted Average of Significant Unobservable Inputs, Loans (Detail)
$ in Millions
Dec. 31, 2025
USD ($)
yr
Dec. 31, 2024
USD ($)
yr
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value $ 4,905 $ 5,460
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 546 683
Corporate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 326 467
Corporate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 290 403
Real estate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 99 117
Other collateralized    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 855 783
Other collateralized | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 138 135
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value 47 60
Other | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans at fair value $ 19 $ 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 0.057 0.062
Minimum | Recovery rate | Corporate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.325 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 3.1 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 0.199 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 0.063 0.068
Maximum | Recovery rate | Corporate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.949 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 4.4 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 0.180 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 0.057 0.063
Weighted Average | Recovery rate | Corporate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.654 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 0.761 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 3.3 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