v3.24.2.u1
Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs $ 188,116   $ 184,946      
Allowance for Credit Losses (95) $ (97) (128) $ (90) $ (96) $ (148)
Gross Unrealized Gains 1,815   2,186      
Gross Unrealized Losses (22,516)   (20,477)      
Bonds available-for-sale [1] 167,320   166,527      
U.S. government and government sponsored entities            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 1,664   1,436      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 7   17      
Gross Unrealized Losses (300)   (233)      
Bonds available-for-sale 1,371   1,220      
Obligations of states, municipalities and political subdivisions            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 5,809   6,466      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 26   58      
Gross Unrealized Losses (800)   (693)      
Bonds available-for-sale 5,035   5,831      
Non-U.S. governments            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 4,530   4,695      
Allowance for Credit Losses 0   (2)      
Gross Unrealized Gains 26   43      
Gross Unrealized Losses (800)   (679)      
Bonds available-for-sale 3,756   4,057      
Corporate debt            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 118,159   120,654      
Allowance for Credit Losses (57)   (71)      
Gross Unrealized Gains 890   1,294      
Gross Unrealized Losses (17,747)   (15,795)      
Bonds available-for-sale 101,245   106,082      
Mortgage-backed, asset-backed and collateralized            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 57,954   51,695      
Allowance for Credit Losses (38)   (55)      
Gross Unrealized Gains 866   774      
Gross Unrealized Losses (2,869)   (3,077)      
Bonds available-for-sale 55,913   49,337      
RMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 16,616   14,491      
Allowance for Credit Losses (20)   (25)      
Gross Unrealized Gains 568   599      
Gross Unrealized Losses (909)   (788)      
Bonds available-for-sale 16,255   14,277      
RMBS | Related Party            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 4   45      
Bonds available-for-sale 5   43      
CMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 11,219   11,045      
Allowance for Credit Losses (18)   (30)      
Gross Unrealized Gains 39   22      
Gross Unrealized Losses (936)   (1,056)      
Bonds available-for-sale 10,304   9,981      
CLO            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 11,537   11,203      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 161   90      
Gross Unrealized Losses (72)   (149)      
Bonds available-for-sale 11,626   11,144      
ABS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost or Costs 18,582   14,956      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 98   63      
Gross Unrealized Losses (952)   (1,084)      
Bonds available-for-sale $ 17,728   $ 13,935      
[1] See Note 8 for details of balances associated with variable interest entities