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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 10,720 $ 10,814
Gross Unrealized Gains 437 554
Gross Unrealized Losses (109) (67)
Estimated Fair Value 11,048 11,301
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 149 $ 152
Fixed Maturities [Member]    
Investments    
Percent of Total 93.00% 94.00%
Amortized Cost $ 9,969 $ 10,187
Gross Unrealized Gains 437 554
Gross Unrealized Losses (109) (67)
Estimated Fair Value 10,297 10,674
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 149 $ 152
Short-term Investments [Member]    
Investments    
Percent of Total 7.00% 6.00%
Amortized Cost $ 751 $ 627
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 751 627
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 50.00% 51.00%
Amortized Cost $ 5,323 $ 5,504
Gross Unrealized Gains 178 267
Gross Unrealized Losses (27) (11)
Estimated Fair Value 5,474 5,760
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 26 $ 23
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 2.00% 2.00%
Amortized Cost $ 265 $ 272
Gross Unrealized Gains 11 14
Gross Unrealized Losses (1) (1)
Estimated Fair Value 275 285
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 18.00% 18.00%
Amortized Cost $ 1,911 $ 1,973
Gross Unrealized Gains 45 63
Gross Unrealized Losses (32) (18)
Estimated Fair Value 1,924 2,018
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (6) $ (6)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 8.00% 8.00%
Amortized Cost $ 857 $ 852
Gross Unrealized Gains 20 26
Gross Unrealized Losses (28) (17)
Estimated Fair Value 849 861
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (8) $ (1)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 5.00%
Amortized Cost $ 561 $ 540
Gross Unrealized Gains 5 12
Gross Unrealized Losses (7) (3)
Estimated Fair Value 559 549
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% 7.00%
Amortized Cost $ 721 $ 730
Gross Unrealized Gains 169 166
Gross Unrealized Losses (1) 0
Estimated Fair Value 889 896
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 137 $ 136
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost $ 331 $ 316
Gross Unrealized Gains 9 6
Gross Unrealized Losses (13) (17)
Estimated Fair Value 327 305
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0