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INVESTMENTS - Amortized Cost of Loans by Credit Quality Indicator and Origination Year (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost Basis by Origination Year    
Total $ 25,117 $ 22,981
Residential mortgages:    
Amortized Cost Basis by Origination Year    
Current fiscal year 1,404 711
Fiscal year before current fiscal year 1,254 602
Two years before current fiscal year 497 340
Three years before current fiscal year 288 168
Four years before current fiscal year 159 121
Prior 121 4
Total 3,723 1,946
Residential mortgages: | Performing    
Amortized Cost Basis by Origination Year    
Current fiscal year 1,404 711
Fiscal year before current fiscal year 1,254 602
Two years before current fiscal year 497 340
Three years before current fiscal year 288 168
Four years before current fiscal year 159 121
Prior 121 4
Total 3,723 1,946
Residential mortgages: | Nonperforming    
Amortized Cost Basis by Origination Year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Total $ 0 $ 0