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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 10,993 $ 10,564
Gross Unrealized Gains 572 405
Gross Unrealized Losses (70) (146)
Estimated Fair Value 11,495 10,823
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 160 $ 17
Fixed Maturities [Member]    
Investments    
Percent of Total 91.00% 94.00%
Amortized Cost $ 10,045 $ 9,974
Gross Unrealized Gains 571 405
Gross Unrealized Losses (70) (146)
Estimated Fair Value 10,546 10,233
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 160 $ 17
Short-term Investments [Member]    
Investments    
Percent of Total 9.00% 6.00%
Amortized Cost $ 948 $ 590
Gross Unrealized Gains 1 0
Gross Unrealized Losses 0 0
Estimated Fair Value 949 590
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 49.00% 50.00%
Amortized Cost $ 5,445 $ 5,269
Gross Unrealized Gains 277 202
Gross Unrealized Losses (17) (39)
Estimated Fair Value 5,705 5,432
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 21 $ 13
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 2.00% 4.00%
Amortized Cost $ 256 $ 424
Gross Unrealized Gains 14 17
Gross Unrealized Losses 0 (1)
Estimated Fair Value 270 440
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 18.00% 15.00%
Amortized Cost $ 1,932 $ 1,612
Gross Unrealized Gains 62 32
Gross Unrealized Losses (18) (31)
Estimated Fair Value 1,976 1,613
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (6) $ (8)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 8.00% 9.00%
Amortized Cost $ 866 $ 998
Gross Unrealized Gains 27 27
Gross Unrealized Losses (12) (38)
Estimated Fair Value 881 987
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 2 $ (21)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 5.00%
Amortized Cost $ 551 $ 575
Gross Unrealized Gains 15 13
Gross Unrealized Losses (4) (5)
Estimated Fair Value 562 583
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 6.00% 8.00%
Amortized Cost $ 682 $ 835
Gross Unrealized Gains 170 110
Gross Unrealized Losses 0 0
Estimated Fair Value 852 945
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 143 $ 33
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost $ 313 $ 261
Gross Unrealized Gains 6 4
Gross Unrealized Losses (19) (32)
Estimated Fair Value 300 233
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0