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INVESTMENTS - Amortized Cost of Loans by Credit Quality Indicator and Origination Year (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost Basis by Origination Year    
Total $ 17,864 $ 16,610
Residential mortgages:    
Amortized Cost Basis by Origination Year    
2023 21  
2022 11  
2021 0  
2020 0  
2019 0  
Prior 0  
Total 32 $ 0
Residential mortgages: | Performing    
Amortized Cost Basis by Origination Year    
2023 21  
2022 11  
2021 0  
2020 0  
2019 0  
Prior 0  
Total 32  
Residential mortgages: | Nonperforming    
Amortized Cost Basis by Origination Year    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 0  
Total $ 0