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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 10,317 $ 10,613
Gross Unrealized Gains 464 344
Gross Unrealized Losses (65) (139)
Estimated Fair Value 10,716 10,818
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 123 $ 118
Government agency obligations as a percentage of total mortgage backed securities 46.00% 48.00%
Fixed Maturities [Member]    
Investments    
Percent of Total 93.00% 93.00%
Amortized Cost $ 9,590 $ 9,884
Gross Unrealized Gains 464 344
Gross Unrealized Losses (65) (139)
Estimated Fair Value 9,989 10,089
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 123 $ 118
Short-term Investments [Member]    
Investments    
Percent of Total 7.00% 7.00%
Amortized Cost $ 727 $ 729
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 727 729
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 45.00% 45.00%
Amortized Cost $ 4,597 $ 4,761
Gross Unrealized Gains 249 168
Gross Unrealized Losses (3) (18)
Estimated Fair Value 4,843 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 $ 157 $ 167
Gross Unrealized Gains 9 9
Gross Unrealized Losses 0 (1)
Estimated Fair Value 166 175
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 21.00% 20.00%
Amortized Cost $ 2,125 $ 2,175
Gross Unrealized Gains 46 13
Gross Unrealized Losses (17) (52)
Estimated Fair Value 2,154 2,136
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ (4)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 9.00% 9.00%
Amortized Cost $ 960 $ 999
Gross Unrealized Gains 23 17
Gross Unrealized Losses (24) (34)
Estimated Fair Value 959 982
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (11) $ (15)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 5.00%
Amortized Cost $ 532 $ 542
Gross Unrealized Gains 10 4
Gross Unrealized Losses (3) (7)
Estimated Fair Value 539 539
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 9.00% 9.00%
Amortized Cost $ 957 $ 942
Gross Unrealized Gains 122 131
Gross Unrealized Losses (3) (5)
Estimated Fair Value 1,076 1,068
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 88 $ 97
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost $ 262 $ 298
Gross Unrealized Gains 5 2
Gross Unrealized Losses (15) (22)
Estimated Fair Value 252 278
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0