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INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Credit Ratings:    
Total $ 10,227 $ 10,191
Middle market loans    
Credit Ratings:    
2026 170  
2025 687  
2024 725  
2023 155  
2022 608  
Prior 1,997  
Revolving Loans 156  
Total 4,498 $ 4,404
Current-period gross writeoffs:    
2026 0  
2025 0  
2024 0  
2023 0  
2022 0  
Prior 11  
Revolving Loans 0  
Total 11  
Middle market loans | BBB Credit Rating    
Credit Ratings:    
2026 0  
2025 21  
2024 55  
2023 37  
2022 0  
Prior 95  
Revolving Loans 10  
Total 218  
Middle market loans | BB Credit Rating    
Credit Ratings:    
2026 164  
2025 388  
2024 533  
2023 73  
2022 312  
Prior 805  
Revolving Loans 67  
Total 2,342  
Middle market loans | B Credit Rating    
Credit Ratings:    
2026 0  
2025 248  
2024 132  
2023 45  
2022 253  
Prior 690  
Revolving Loans 37  
Total 1,405  
Middle market loans | CCC Credit Rating    
Credit Ratings:    
2026 0  
2025 25  
2024 3  
2023 0  
2022 34  
Prior 300  
Revolving Loans 31  
Total 393  
Middle market loans | CC Credit Rating    
Credit Ratings:    
2026 0  
2025 5  
2024 2  
2023 0  
2022 9  
Prior 67  
Revolving Loans 6  
Total 89  
Middle market loans | C and Lower Credit Rating    
Credit Ratings:    
2026 6  
2025 0  
2024 0  
2023 0  
2022 0  
Prior 40  
Revolving Loans 5  
Total $ 51