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INVESTMENTS - Commercial Mortgage Loans by Key Credit Quality Indicator (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Loan-to-Value Ratio:    
Total $ 10,559 $ 11,224
Commercial mortgage loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 2.55  
Loan-to-Value Ratio:    
2025 $ 0  
2024 12  
2023 32  
2022 0  
2021 270  
Prior 1,128  
Total 1,442 $ 1,537
Current-period gross writeoffs:    
2025 0  
2024 0  
2023 0  
2022 0  
2021 0  
Prior 0  
Total $ 0  
Commercial mortgage loans | 2025    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 0.00  
Commercial mortgage loans | 2024    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 1.10  
Commercial mortgage loans | 2023    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 2.55  
Commercial mortgage loans | 2022    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 0.00  
Commercial mortgage loans | 2021    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 3.05  
Commercial mortgage loans | Prior    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 2.45  
Commercial mortgage loans | Loan to Value Ratio, 0.00% to 59.99%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 2.75  
Loan-to-Value Ratio:    
2025 $ 0  
2024 0  
2023 32  
2022 0  
2021 245  
Prior 949  
Total $ 1,226  
Commercial mortgage loans | Loan to Value Ratio, 60.00% to 69.99%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 2.13  
Loan-to-Value Ratio:    
2025 $ 0  
2024 0  
2023 0  
2022 0  
2021 25  
Prior 69  
Total $ 94  
Commercial mortgage loans | Loan to Value Ratio, 70.00% to 79.99%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 1.50  
Loan-to-Value Ratio:    
2025 $ 0  
2024 0  
2023 0  
2022 0  
2021 0  
Prior 8  
Total $ 8  
Commercial mortgage loans | Loan-to-Value Ratio, 80.00% or greater    
Financing Receivable, Credit Quality Indicator [Line Items]    
Weighted Average DSCR 0.85  
Loan-to-Value Ratio:    
2025 $ 0  
2024 12  
2023 0  
2022 0  
2021 0  
Prior 102  
Total $ 114