v3.23.1
Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs $ 181,274 $ 182,593    
Allowance for Credit Losses (148) (78) $ (131) $ (5)
Gross Unrealized Gains 1,424 17,328    
Gross Unrealized Losses (25,757) (1,275)    
Bonds available for sale [1] 156,793 198,568    
Non-Investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Bonds available for sale 16,700 20,400    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 1,405 1,406    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 17 306    
Gross Unrealized Losses (224) 0    
Bonds available for sale 1,198 1,712    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 6,808 7,321    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 42 1,362    
Gross Unrealized Losses (924) (7)    
Bonds available for sale 5,926 8,676    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 5,251 6,026    
Allowance for Credit Losses (5) 0    
Gross Unrealized Gains 25 495    
Gross Unrealized Losses (879) (124)    
Bonds available for sale 4,392 6,397    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 124,068 128,417    
Allowance for Credit Losses (116) (72)    
Gross Unrealized Gains 729 12,674    
Gross Unrealized Losses (19,989) (956)    
Bonds available for sale 104,692 140,063    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 43,742 39,423    
Allowance for Credit Losses (27) (6)    
Gross Unrealized Gains 611 2,491    
Gross Unrealized Losses (3,741) (188)    
Bonds available for sale 40,585 41,720    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 12,267 13,236    
Allowance for Credit Losses (27) (6)    
Gross Unrealized Gains 574 1,762    
Gross Unrealized Losses (870) (34)    
Bonds available for sale 11,944 14,958    
RMBS | Total derivatives with related parties        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 43 44    
Bonds available for sale 39 47    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 11,176 10,903    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 7 451    
Gross Unrealized Losses (1,115) (54)    
Bonds available for sale 10,068 11,300    
CLO        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 8,547 7,382    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 15 73    
Gross Unrealized Losses (376) (53)    
Bonds available for sale 8,186 7,402    
CLO | Total derivatives with related parties        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs   823    
Bonds available for sale   862    
ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost or Costs 11,752 7,902    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 15 205    
Gross Unrealized Losses (1,380) (47)    
Bonds available for sale $ 10,387 $ 8,060    
[1] See Note 9 for details of balances associated with variable interest entities