v3.26.1
Investments (Financing Receivables Past Due) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 11,477 $ 11,268  
Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 10,969 10,821  
Residential Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 508 447  
Financial Asset, Not Past Due | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 10,938 10,805  
Financial Asset, Not Past Due | Residential Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 503 444  
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 5 0  
Financial Asset, 30 to 59 Days Past Due | Residential Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1 3  
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 26 0  
Financial Asset, 60 to 89 Days Past Due | Residential 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      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 4   $ 6
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 0 16  
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 4 $ 0