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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized Cost $ 9,058   $ 9,639      
Allowance for Credit Losses (75) $ (73) 0 $ (191) $ (197) $ (185)
Gross Unrealized Gains 566   517      
Gross Unrealized Losses (98)   (34)      
Estimated Fair Value 9,451   10,122      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (52)   $ 59      
Government agency obligations as a percentage of total mortgage backed securities 39.00%   42.00%      
Fixed Maturities [Member]            
Schedule of Investments [Line Items]            
Percent of Total 91.00%   87.00%      
Amortized Cost $ 8,237   $ 8,371      
Allowance for Credit Losses (75)          
Gross Unrealized Gains 565   517      
Gross Unrealized Losses (97)   (34)      
Estimated Fair Value 8,630   8,854      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (52)   $ 59      
Fixed Maturities [Member] | Obligations of state and political subdivisions [Member]            
Schedule of Investments [Line Items]            
Percent of Total 42.00%   42.00%      
Amortized Cost $ 3,789   $ 4,036      
Allowance for Credit Losses (11)          
Gross Unrealized Gains 336   305      
Gross Unrealized Losses (1)   (1)      
Estimated Fair Value 4,113   4,340      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (1)   $ 40      
Fixed Maturities [Member] | US government and agencies [Member]            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   1.00%      
Amortized Cost $ 160   $ 137      
Allowance for Credit Losses 0          
Gross Unrealized Gains 14   10      
Gross Unrealized Losses 0   0      
Estimated Fair Value 174   147      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0   $ 0      
Fixed Maturities [Member] | Corporate securities [Member]            
Schedule of Investments [Line Items]            
Percent of Total 26.00%   23.00%      
Amortized Cost $ 2,327   $ 2,137      
Allowance for Credit Losses (38)          
Gross Unrealized Gains 138   103      
Gross Unrealized Losses (38)   (19)      
Estimated Fair Value 2,389   2,221      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (18)   $ (8)      
Fixed Maturities [Member] | RMBS [Member]            
Schedule of Investments [Line Items]            
Percent of Total 7.00%   8.00%      
Amortized Cost $ 649   $ 745      
Allowance for Credit Losses (20)          
Gross Unrealized Gains 37   37      
Gross Unrealized Losses (31)   (7)      
Estimated Fair Value 635   775      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (29)   $ 8      
Fixed Maturities [Member] | CMBS [Member]            
Schedule of Investments [Line Items]            
Percent of Total 4.00%   4.00%      
Amortized Cost $ 384   $ 402      
Allowance for Credit Losses 0          
Gross Unrealized Gains 27   17      
Gross Unrealized Losses 0   0      
Estimated Fair Value 411   419      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0   $ 0      
Fixed Maturities [Member] | Asset-backed Securities [Member]            
Schedule of Investments [Line Items]            
Percent of Total 8.00%   7.00%      
Amortized Cost $ 780   $ 684      
Allowance for Credit Losses (6)          
Gross Unrealized Gains 12   38      
Gross Unrealized Losses (18)   (2)      
Estimated Fair Value 768   720      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (4)   $ 16      
Fixed Maturities [Member] | Foreign government securities [Member]            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   2.00%      
Amortized Cost $ 148   $ 230      
Allowance for Credit Losses 0          
Gross Unrealized Gains 1   7      
Gross Unrealized Losses (9)   (5)      
Estimated Fair Value 140   232      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0   $ 3      
Short-term Investments [Member]            
Schedule of Investments [Line Items]            
Percent of Total 9.00%   13.00%      
Amortized Cost $ 821   $ 1,268      
Allowance for Credit Losses 0          
Gross Unrealized Gains 1   0      
Gross Unrealized Losses (1)   0      
Estimated Fair Value 821   1,268      
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0   $ 0