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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]        
Percent of Total 100.00% 100.00%    
Amortized Cost $ 9,343 $ 9,639    
Allowance for Credit Losses (73) 0 $ (197) $ (185)
Gross Unrealized Gains 407 517    
Gross Unrealized Losses (176) (34)    
Estimated Fair Value 9,501 10,122    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (83) $ 59    
Government agency obligations as a percentage of total mortgage backed securities 44.00% 42.00%    
Fixed Maturities [Member]        
Schedule of Investments [Line Items]        
Percent of Total 90.00% 87.00%    
Amortized Cost $ 8,410 $ 8,371    
Allowance for Credit Losses (73)      
Gross Unrealized Gains 406 517    
Gross Unrealized Losses (175) (34)    
Estimated Fair Value 8,568 8,854    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (83) $ 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 $ 3,952 $ 4,036    
Allowance for Credit Losses (11)      
Gross Unrealized Gains 269 305    
Gross Unrealized Losses (6) (1)    
Estimated Fair Value 4,204 4,340    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (2) $ 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 15 10    
Gross Unrealized Losses 0 0    
Estimated Fair Value 175 147    
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 25.00% 23.00%    
Amortized Cost $ 2,292 $ 2,137    
Allowance for Credit Losses (39)      
Gross Unrealized Gains 58 103    
Gross Unrealized Losses (78) (19)    
Estimated Fair Value 2,233 2,221    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (36) $ (8)    
Fixed Maturities [Member] | RMBS [Member]        
Schedule of Investments [Line Items]        
Percent of Total 8.00% 8.00%    
Amortized Cost $ 737 $ 745    
Allowance for Credit Losses (16)      
Gross Unrealized Gains 39 37    
Gross Unrealized Losses (43) (7)    
Estimated Fair Value 717 775    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (39) $ 8    
Fixed Maturities [Member] | CMBS [Member]        
Schedule of Investments [Line Items]        
Percent of Total 4.00% 4.00%    
Amortized Cost $ 399 $ 402    
Allowance for Credit Losses 0      
Gross Unrealized Gains 15 17    
Gross Unrealized Losses 0 0    
Estimated Fair Value 414 419    
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 7.00% 7.00%    
Amortized Cost $ 687 $ 684    
Allowance for Credit Losses (7)      
Gross Unrealized Gains 9 38    
Gross Unrealized Losses (36) (2)    
Estimated Fair Value 653 720    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (6) $ 16    
Fixed Maturities [Member] | Foreign government securities [Member]        
Schedule of Investments [Line Items]        
Percent of Total 2.00% 2.00%    
Amortized Cost $ 183 $ 230    
Allowance for Credit Losses 0      
Gross Unrealized Gains 1 7    
Gross Unrealized Losses (12) (5)    
Estimated Fair Value 172 232    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 3    
Short-term Investments [Member]        
Schedule of Investments [Line Items]        
Percent of Total 10.00% 13.00%    
Amortized Cost $ 933 $ 1,268    
Allowance for Credit Losses 0      
Gross Unrealized Gains 1 0    
Gross Unrealized Losses (1) 0    
Estimated Fair Value 933 1,268    
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0