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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized cost $ 8,938   $ 9,639      
Allowance for credit loss (76) $ (75) 0 $ (191) $ (191) $ (185)
Gross Unrealized Gains 614   517      
Gross Unrealized Losses (62)   (34)      
Estimated Fair Value 9,414   10,122      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (42)   $ 59      
Government agency obligations as a percentage of total mortgage backed securities 37.00%   42.00%      
Fixed-maturity securities            
Schedule of Investments [Line Items]            
Percent of Total 90.00%   87.00%      
Amortized cost $ 8,080   $ 8,371      
Allowance for credit loss (76)          
Gross Unrealized Gains 614   517      
Gross Unrealized Losses (62)   (34)      
Estimated Fair Value 8,556   8,854      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (42)   $ 59      
Fixed-maturity securities | Obligations of state and political subdivisions            
Schedule of Investments [Line Items]            
Percent of Total 41.00%   42.00%      
Amortized cost $ 3,665   $ 4,036      
Allowance for credit loss (11)          
Gross Unrealized Gains 347   305      
Gross Unrealized Losses (2)   (1)      
Estimated Fair Value 3,999   4,340      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0   $ 40      
Fixed-maturity securities | U.S. government and agencies            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   1.00%      
Amortized cost $ 179   $ 137      
Allowance for credit loss 0          
Gross Unrealized Gains 13   10      
Gross Unrealized Losses 0   0      
Estimated Fair Value 192   147      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0   $ 0      
Fixed-maturity securities | Corporate securities            
Schedule of Investments [Line Items]            
Percent of Total 24.00%   23.00%      
Amortized cost $ 2,179   $ 2,137      
Allowance for credit loss (39)          
Gross Unrealized Gains 159   103      
Gross Unrealized Losses (26)   (19)      
Estimated Fair Value 2,273   2,221      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (17)   $ (8)      
Fixed-maturity securities | RMBS            
Schedule of Investments [Line Items]            
Percent of Total 7.00%   8.00%      
Amortized cost $ 612   $ 745      
Allowance for credit loss (20)          
Gross Unrealized Gains 37   37      
Gross Unrealized Losses (23)   (7)      
Estimated Fair Value 606   775      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (22)   $ 8      
Fixed-maturity securities | Commercial mortgage-backed securities (CMBS)            
Schedule of Investments [Line Items]            
Percent of Total 4.00%   4.00%      
Amortized cost $ 367   $ 402      
Allowance for credit loss 0          
Gross Unrealized Gains 29   17      
Gross Unrealized Losses 0   0      
Estimated Fair Value 396   419      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0   $ 0      
Fixed-maturity securities | Asset-backed securities            
Schedule of Investments [Line Items]            
Percent of Total 10.00%   7.00%      
Amortized cost $ 932   $ 684      
Allowance for credit loss (6)          
Gross Unrealized Gains 25   38      
Gross Unrealized Losses (4)   (2)      
Estimated Fair Value 947   720      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (3)   $ 16      
Fixed-maturity securities | Non-U.S. government securities            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   2.00%      
Amortized cost $ 146   $ 230      
Allowance for credit loss 0          
Gross Unrealized Gains 4   7      
Gross Unrealized Losses (7)   (5)      
Estimated Fair Value 143   232      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0   $ 3      
Short-term investments            
Schedule of Investments [Line Items]            
Percent of Total 10.00%   13.00%      
Amortized cost $ 858   $ 1,268      
Allowance for credit loss 0          
Gross Unrealized Gains 0   0      
Gross Unrealized Losses 0   0      
Estimated Fair Value 858   1,268      
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0   $ 0