v3.26.1
INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
investment
Mar. 31, 2025
USD ($)
investment
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]        
Held to maturity securities transferred to available for sale securities, number of investments | investment 0 0    
Real estate owned impairments $ 24 $ 0    
Real estate owned, estimated fair value after impairment 179      
Equity securities, FV-NI, unrealized gain (loss) (30) 55    
Transitional real estate loan commitments 131      
Middle market loan commitments 692      
Other loan commitments 1      
Nonaccrual loans, interest income 7 1    
Financing Receivable, Modified, Commitment to Lend 0   $ 15  
Amortized Cost 15,756   16,125  
Allowance for credit losses 457   426  
Real estate owned, accumulated depreciation 46   41  
Limited partnerships investment commitments 2,800   3,000  
Securities lending, securities received as collateral 327   2,200  
Repurchase agreements and repurchase-to-maturity transactions outstanding 0   0  
Variable Interest Entity, Not Consolidated        
Schedule of Investments [Line Items]        
Limited partnerships investment commitments 2,100   2,100  
Real estate owned        
Schedule of Investments [Line Items]        
Real estate owned, depreciation expense 7 6    
Transitional real estate loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 83   30  
Allowance for credit losses 286 203 277 $ 199
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure        
Schedule of Investments [Line Items]        
Mortgage Loans in Process of Foreclosure, Amount 139      
Allowance for credit losses 61      
Middle market loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 40   36  
Allowance for credit losses 163 $ 150 $ 138 $ 140
Zero-credit-loss expectation | Japan government and agencies        
Schedule of Investments [Line Items]        
Amortized Cost $ 15,000      
California | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 22.00%      
Texas | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 14.00%      
Florida | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 7.00%