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Investments (Mortgage Loans in Nonaccrual Status by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]    
Financing receivable in nonaccrual status $ 132 $ 107
Commercial    
Financing Receivable, Nonaccrual [Line Items]    
Financing receivable in nonaccrual status 31 17
Agricultural    
Financing Receivable, Nonaccrual [Line Items]    
Financing receivable in nonaccrual status 0 0
Residential    
Financing Receivable, Nonaccrual [Line Items]    
Financing receivable in nonaccrual status $ 101 $ 90