v3.25.2
INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
investment
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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 $ 6 $ 0 $ 6 $ 0        
Real estate owned, fair value 12   12          
Equity securities, FV-NI, unrealized gain (loss) 101 15 47 70        
Transitional real estate loan commitments 175   175          
Middle market loan commitments 646   646          
Other Loans Commitments 1   1          
Nonaccrual loans, interest income 0 0 1 0        
Financing Receivable, Modified, Commitment to Lend 12   12     $ 14    
Amortized Cost 17,439   17,439     15,971    
Credit allowance 384   384     355    
Real estate owned, accumulated depreciation 28   28     14    
Limited partnerships investment commitments $ 2,400   $ 2,400     2,800    
Percentage that the lending policy requires that the fair value of the securities received as collateral be of the fair value of the loaned securities 102.00%   102.00%          
Percentage that the lending policy requires that the fair value of the unrestricted cash received as collateral be of the fair value of the loaned securities 100.00%   100.00%          
Securities Lending, Securities Received as Collateral $ 1,500   $ 1,500     3,000    
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   0     0    
Variable Interest Entity, Not Consolidated                
Schedule of Investments [Line Items]                
Limited partnerships investment commitments 2,100   2,100     2,100    
Real estate owned                
Schedule of Investments [Line Items]                
Depreciation 8 3 14 4        
Transitional real estate loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance 45   45     140    
Credit allowance 243 123 243 123 $ 203 199 $ 114 $ 112
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure                
Schedule of Investments [Line Items]                
Mortgage Loans in Process of Foreclosure, Amount 136   136          
Credit allowance 20   20          
Middle market loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance 0   0     5    
Credit allowance 127 $ 98 127 $ 98 $ 150 $ 140 $ 99 $ 146
Zero-credit-loss expectation | Japan government and agencies                
Schedule of Investments [Line Items]                
Amortized Cost $ 16,600   $ 16,600          
CALIFORNIA | Geographic Concentration Risk | Mortgages                
Schedule of Investments [Line Items]                
Concentration Risk, Percentage     20.00%          
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     10.00%