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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 10,296 $ 10,613
Gross Unrealized Gains 488 344
Gross Unrealized Losses (51) (139)
Estimated Fair Value 10,733 10,818
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 63 $ 118
Government agency obligations as a percentage of total mortgage backed securities 45.00% 48.00%
Fixed Maturities [Member]    
Investments    
Percent of Total 89.00% 93.00%
Amortized Cost $ 9,137 $ 9,884
Gross Unrealized Gains 488 344
Gross Unrealized Losses (51) (139)
Estimated Fair Value 9,574 10,089
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 63 $ 118
Short-term Investments [Member]    
Investments    
Percent of Total 11.00% 7.00%
Amortized Cost $ 1,159 $ 729
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 1,159 729
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 $ 4,370 $ 4,761
Gross Unrealized Gains 313 168
Gross Unrealized Losses 0 (18)
Estimated Fair Value 4,683 4,911
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 46 $ 40
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 1.00% 2.00%
Amortized Cost $ 154 $ 167
Gross Unrealized Gains 11 9
Gross Unrealized Losses 0 (1)
Estimated Fair Value 165 175
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 22.00% 20.00%
Amortized Cost $ 2,212 $ 2,175
Gross Unrealized Gains 71 13
Gross Unrealized Losses (16) (52)
Estimated Fair Value 2,267 2,136
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (1) $ (4)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 9.00% 9.00%
Amortized Cost $ 914 $ 999
Gross Unrealized Gains 37 17
Gross Unrealized Losses (13) (34)
Estimated Fair Value 938 982
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 $ 478 $ 542
Gross Unrealized Gains 18 4
Gross Unrealized Losses (1) (7)
Estimated Fair Value 495 539
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 $ 746 $ 942
Gross Unrealized Gains 36 131
Gross Unrealized Losses (3) (5)
Estimated Fair Value 779 1,068
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 14 $ 97
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost $ 263 $ 298
Gross Unrealized Gains 2 2
Gross Unrealized Losses (18) (22)
Estimated Fair Value 247 278
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0