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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]        
Percent of Total 100.00% 100.00%    
Amortized Cost $ 8,968 $ 9,055    
Allowance for Credit Losses (81) (78) $ (73) $ 0
Gross Unrealized Gains 578 698    
Gross Unrealized Losses (77) (51)    
Estimated Fair Value 9,388 9,624    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (46) $ (39)    
Government agency obligations as a percentage of total mortgage backed securities 34.00% 35.00%    
Fixed-maturity securities        
Schedule of Investments [Line Items]        
Percent of Total 92.00% 91.00%    
Amortized Cost $ 8,267 $ 8,204    
Allowance for Credit Losses (81) (78)    
Gross Unrealized Gains 578 698    
Gross Unrealized Losses (77) (51)    
Estimated Fair Value 8,687 8,773    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (46) $ (39)    
Fixed-maturity securities | Obligations of state and political subdivisions        
Schedule of Investments [Line Items]        
Percent of Total 40.00% 40.00%    
Amortized Cost $ 3,613 $ 3,633    
Allowance for Credit Losses (11) (11)    
Gross Unrealized Gains 319 369    
Gross Unrealized Losses (5) 0    
Estimated Fair Value 3,916 3,991    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0    
Fixed-maturity securities | U.S. government and agencies        
Schedule of Investments [Line Items]        
Percent of Total 2.00% 2.00%    
Amortized Cost $ 138 $ 151    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 9 12    
Gross Unrealized Losses (3) (1)    
Estimated Fair Value 144 162    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0    
Fixed-maturity securities | Corporate securities        
Schedule of Investments [Line Items]        
Percent of Total 27.00% 26.00%    
Amortized Cost $ 2,504 $ 2,366    
Allowance for Credit Losses (43) (42)    
Gross Unrealized Gains 153 210    
Gross Unrealized Losses (42) (21)    
Estimated Fair Value 2,572 2,513    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (25) $ (16)    
Fixed-maturity securities | RMBS        
Schedule of Investments [Line Items]        
Percent of Total 6.00% 6.00%    
Amortized Cost $ 541 $ 571    
Allowance for Credit Losses (20) (19)    
Gross Unrealized Gains 29 35    
Gross Unrealized Losses (20) (21)    
Estimated Fair Value 530 566    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (19) $ (20)    
Fixed-maturity securities | CMBS        
Schedule of Investments [Line Items]        
Percent of Total 4.00% 4.00%    
Amortized Cost $ 351 $ 358    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 23 29    
Gross Unrealized Losses 0 0    
Estimated Fair Value 374 387    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0    
Fixed-maturity securities | CLOs and CLO warehouse assets        
Schedule of Investments [Line Items]        
Percent of Total 6.00% 6.00%    
Amortized Cost $ 523 $ 531    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 2 2    
Gross Unrealized Losses 0 (1)    
Estimated Fair Value 525 532    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0    
Fixed-maturity securities | Others        
Schedule of Investments [Line Items]        
Percent of Total 5.00% 5.00%    
Amortized Cost $ 430 $ 427    
Allowance for Credit Losses (7) (6)    
Gross Unrealized Gains 35 31    
Gross Unrealized Losses (2) (3)    
Estimated Fair Value 456 449    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (2) $ (3)    
Fixed-maturity securities | Non-U.S. government securities        
Schedule of Investments [Line Items]        
Percent of Total 2.00% 2.00%    
Amortized Cost $ 167 $ 167    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 8 10    
Gross Unrealized Losses (5) (4)    
Estimated Fair Value 170 173    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0    
Short-term investments        
Schedule of Investments [Line Items]        
Percent of Total 8.00% 9.00%    
Amortized Cost $ 701 $ 851    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Estimated Fair Value 701 851    
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0 $ 0