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Investments (Financing Receivables Past Due) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 10,652 $ 8,952
Commercial Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 10,408 8,952
Residential Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 244 0
Financial Asset, Not Past Due | Commercial Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 10,367 8,934
Financial Asset, Not Past Due | Residential Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 244 0
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 12
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 41 $ 6