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Investments Amortized Costs of Non-accrual Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized cost of loans on non-accrual $ 57 $ 71
Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized cost of loans on non-accrual 57 62
Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized cost of loans on non-accrual $ 0 $ 9