v3.25.4
Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs $ 203,848 $ 191,058    
Allowance for credit losses (130) (119) $ (128) $ (148)
Gross unrealized gains 3,322 1,917    
Gross unrealized losses (17,659) (22,016)    
Bonds available-for-sale [1] 189,381 170,840    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 1,655 1,698    
Allowance for credit losses 0 0    
Gross unrealized gains 11 7    
Gross unrealized losses (329) (337)    
Bonds available-for-sale 1,337 1,368    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 5,146 5,479    
Allowance for credit losses 0 0    
Gross unrealized gains 30 20    
Gross unrealized losses (690) (838)    
Bonds available-for-sale 4,486 4,661    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 5,021 4,734    
Allowance for credit losses 0 0    
Gross unrealized gains 83 26    
Gross unrealized losses (617) (856)    
Bonds available-for-sale 4,487 3,904    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 134,444 123,134    
Allowance for credit losses (94) (86)    
Gross unrealized gains 2,099 927    
Gross unrealized losses (14,378) (17,497)    
Bonds available-for-sale 122,071 106,478    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 57,582 56,013    
Allowance for credit losses (36) (33)    
Gross unrealized gains 1,099 937    
Gross unrealized losses (1,645) (2,488)    
Bonds available-for-sale 57,000 54,429    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 16,297 16,077    
Allowance for credit losses (8) (15)    
Gross unrealized gains 658 562    
Gross unrealized losses (597) (840)    
Bonds available-for-sale 16,350 15,784    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 9,749 10,260    
Allowance for credit losses (23) (18)    
Gross unrealized gains 78 73    
Gross unrealized losses (497) (738)    
Bonds available-for-sale 9,307 9,577    
CLO        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 9,036 10,020    
Allowance for credit losses 0 0    
Gross unrealized gains 104 156    
Gross unrealized losses (48) (58)    
Bonds available-for-sale 9,092 10,118    
ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 22,500 19,656    
Allowance for credit losses (5) 0    
Gross unrealized gains 259 146    
Gross unrealized losses (503) (852)    
Bonds available-for-sale $ 22,251 $ 18,950    
[1] See Note 8 for details of balances associated with variable interest entities