v3.26.1
Investments (Mortgage Loans by Maturity Date) (Details) - USD ($)
$ in Millions
Mar. 31, 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 $ 11,477 $ 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 $ 10,969 $ 10,821
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 95.60% 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 $ 508 $ 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 $ 4,620 $ 4,563
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 42.10% 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 $ 190 $ 184
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 37.40% 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 $ 5,432 $ 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 $ 0 $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 0.00% 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 $ 917 $ 1,033
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.40% 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 $ 318 $ 263
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 62.60% 58.80%