v3.26.3
Investments (Mortgage Loans by Maturity Date) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 12,344 $ 11,268
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%
Commercial Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 11,736 $ 10,821
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 95.10% 96.00%
Residential Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 608 $ 447
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%
Due within five years | Commercial Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 5,110 $ 4,563
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 43.50% 42.20%
Due within five years | Residential Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 234 $ 184
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 38.50% 41.20%
Due after five years through ten years | Commercial Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 5,801 $ 5,225
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 49.50% 48.30%
Due after five years through ten years | Residential Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 1 $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 0.20% 0.00%
Due after ten years | Commercial Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 825 $ 1,033
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.00% 9.50%
Due after ten years | Residential Real Estate    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 373 $ 263
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 61.30% 58.80%