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Mortgage Loans (Details) - Table - Aging and Delinquency Statistics - Conventional Mortgage Loan - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mortgage Loan Delinquency Statistics    
Total Amortized Cost $ 630 $ 640
In process of foreclosure, included above 1 1
Financing Receivable, Nonaccrual $ 17 $ 15
Serious delinquencies as a percentage of total mortgage loans outstanding 2.71% 2.42%
Mortgage loans on nonaccrual status, with no allowance $ 5 $ 5
30 to 59 Days Past Due    
Mortgage Loan Delinquency Statistics    
Total Amortized Cost 10 8
60 to 89 Days Past Due    
Mortgage Loan Delinquency Statistics    
Total Amortized Cost 2 3
Equal to or Greater than 90 Days Past Due    
Mortgage Loan Delinquency Statistics    
Total Amortized Cost 17 15
Financial Asset, Past Due    
Mortgage Loan Delinquency Statistics    
Total Amortized Cost 29 26
Financial Asset, Not Past Due    
Mortgage Loan Delinquency Statistics    
Total Amortized Cost $ 601 $ 614