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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 10,693 $ 10,564
Gross Unrealized Gains 574 405
Gross Unrealized Losses (84) (146)
Estimated Fair Value 11,183 10,823
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 164 $ 17
Fixed Maturities [Member]    
Investments    
Percent of Total 94.00% 94.00%
Amortized Cost $ 10,018 $ 9,974
Gross Unrealized Gains 571 405
Gross Unrealized Losses (84) (146)
Estimated Fair Value 10,505 10,233
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 164 $ 17
Short-term Investments [Member]    
Investments    
Percent of Total 6.00% 6.00%
Amortized Cost $ 675 $ 590
Gross Unrealized Gains 3 0
Gross Unrealized Losses 0 0
Estimated Fair Value 678 590
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 51.00% 50.00%
Amortized Cost $ 5,454 $ 5,269
Gross Unrealized Gains 274 202
Gross Unrealized Losses (19) (39)
Estimated Fair Value 5,709 5,432
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 28 $ 13
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 4.00%
Amortized Cost $ 274 $ 424
Gross Unrealized Gains 15 17
Gross Unrealized Losses 0 (1)
Estimated Fair Value 289 440
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 19.00% 15.00%
Amortized Cost $ 1,998 $ 1,612
Gross Unrealized Gains 66 32
Gross Unrealized Losses (23) (31)
Estimated Fair Value 2,041 1,613
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (8) $ (8)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 8.00% 9.00%
Amortized Cost $ 878 $ 998
Gross Unrealized Gains 29 27
Gross Unrealized Losses (13) (38)
Estimated Fair Value 894 987
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 3 $ (21)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 5.00%
Amortized Cost $ 557 $ 575
Gross Unrealized Gains 14 13
Gross Unrealized Losses (4) (5)
Estimated Fair Value 567 583
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 5.00% 8.00%
Amortized Cost $ 554 $ 835
Gross Unrealized Gains 168 110
Gross Unrealized Losses 0 0
Estimated Fair Value 722 945
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 141 $ 33
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost $ 303 $ 261
Gross Unrealized Gains 5 4
Gross Unrealized Losses (25) (32)
Estimated Fair Value 283 233
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 $ 0