v3.26.1
Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs $ 204,752 $ 203,848    
Allowance for Credit Losses (168) (130) $ (114) $ (119)
Gross Unrealized Gains 2,251 3,322    
Gross Unrealized Losses (19,162) (17,659)    
Fair Value [1] 187,673 189,381    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 1,661 1,655    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 7 11    
Gross Unrealized Losses (341) (329)    
Fair Value 1,327 1,337    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 4,835 5,146    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 25 30    
Gross Unrealized Losses (691) (690)    
Fair Value 4,169 4,486    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 4,781 5,021    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 43 83    
Gross Unrealized Losses (699) (617)    
Fair Value 4,125 4,487    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 135,689 134,444    
Allowance for Credit Losses (129) (94)    
Gross Unrealized Gains 1,300 2,099    
Gross Unrealized Losses (15,662) (14,378)    
Fair Value 121,198 122,071    
Mortgage-backed, asset-backed and collateralized:        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 57,786 57,582    
Allowance for Credit Losses (39) (36)    
Gross Unrealized Gains 876 1,099    
Gross Unrealized Losses (1,769) (1,645)    
Fair Value 56,854 57,000    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 16,791 16,297    
Allowance for Credit Losses (10) (8)    
Gross Unrealized Gains 581 658    
Gross Unrealized Losses (618) (597)    
Fair Value 16,744 16,350    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 9,955 9,749    
Allowance for Credit Losses (22) (23)    
Gross Unrealized Gains 67 78    
Gross Unrealized Losses (508) (497)    
Fair Value 9,492 9,307    
CLO        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 8,788 9,036    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 54 104    
Gross Unrealized Losses (87) (48)    
Fair Value 8,755 9,092    
ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 22,252 22,500    
Allowance for Credit Losses (7) (5)    
Gross Unrealized Gains 174 259    
Gross Unrealized Losses (556) (503)    
Fair Value $ 21,863 $ 22,251    
[1] See Note 8 for details of balances associated with variable interest entities