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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 9,953 $ 10,613
Gross Unrealized Gains 518 344
Gross Unrealized Losses (52) (139)
Estimated Fair Value 10,419 10,818
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 52 $ 118
Government agency obligations as a percentage of total mortgage backed securities 44.00% 48.00%
Fixed Maturities [Member]    
Investments    
Percent of Total 89.00% 93.00%
Amortized Cost $ 8,811 $ 9,884
Gross Unrealized Gains 518 344
Gross Unrealized Losses (52) (139)
Estimated Fair Value 9,277 10,089
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 52 $ 118
Short-term Investments [Member]    
Investments    
Percent of Total 11.00% 7.00%
Amortized Cost $ 1,142 $ 729
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 1,142 729
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Obligations of state and political subdivisions [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 42.00% 45.00%
Amortized Cost $ 4,132 $ 4,761
Gross Unrealized Gains 331 168
Gross Unrealized Losses 0 (18)
Estimated Fair Value 4,463 4,911
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 42 $ 40
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 1.00% 2.00%
Amortized Cost $ 144 $ 167
Gross Unrealized Gains 11 9
Gross Unrealized Losses 0 (1)
Estimated Fair Value 155 175
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 24.00% 20.00%
Amortized Cost $ 2,286 $ 2,175
Gross Unrealized Gains 80 13
Gross Unrealized Losses (27) (52)
Estimated Fair Value 2,339 2,136
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (4) $ (4)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 8.00% 9.00%
Amortized Cost $ 846 $ 999
Gross Unrealized Gains 41 17
Gross Unrealized Losses (10) (34)
Estimated Fair Value 877 982
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 4 $ (15)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 5.00%
Amortized Cost $ 448 $ 542
Gross Unrealized Gains 21 4
Gross Unrealized Losses 0 (7)
Estimated Fair Value 469 539
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 7.00% 9.00%
Amortized Cost $ 745 $ 942
Gross Unrealized Gains 33 131
Gross Unrealized Losses (3) (5)
Estimated Fair Value 775 1,068
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 10 $ 97
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 2.00% 3.00%
Amortized Cost $ 210 $ 298
Gross Unrealized Gains 1 2
Gross Unrealized Losses (12) (22)
Estimated Fair Value 199 278
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0