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Investments and Cash - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Less than 12 months    
Fair value $ 2,841 $ 806
Unrealized loss (63) (10)
12 months or more    
Fair Value 841 975
Unrealized loss (75) (57)
Total    
Fair value 3,682 1,781
Unrealized loss $ (138) $ (67)
Number of securities    
Less than 12 months (in securities) | Security 823 244
12 months or more (in securities) | Security 240 264
Total (in securities) | Security 1,043 499
Number of securities with OTTI    
Less than 12 months (in securities) | Security 26 17
12 months or more (in securities) | Security 15 15
Total (in securities) | Security 40 31
Obligations of state and political subdivisions [Member]    
Less than 12 months    
Fair value $ 993 $ 166
Unrealized loss (15) (4)
12 months or more    
Fair Value 229 281
Unrealized loss (10) (7)
Total    
Fair value 1,222 447
Unrealized loss (25) (11)
US government and agencies [Member]    
Less than 12 months    
Fair value 22 151
Unrealized loss 0 0
12 months or more    
Fair Value 18 18
Unrealized loss (1) (1)
Total    
Fair value 40 169
Unrealized loss (1) (1)
Corporate securities [Member]    
Less than 12 months    
Fair value 973 201
Unrealized loss (26) (1)
12 months or more    
Fair Value 208 240
Unrealized loss (22) (17)
Total    
Fair value 1,181 441
Unrealized loss (48) (18)
RMBS [Member]    
Less than 12 months    
Fair value 385 191
Unrealized loss (13) (5)
12 months or more    
Fair Value 194 213
Unrealized loss (18) (12)
Total    
Fair value 579 404
Unrealized loss (31) (17)
CMBS [Member]    
Less than 12 months    
Fair value 245 29
Unrealized loss (5) 0
12 months or more    
Fair Value 77 80
Unrealized loss (5) (3)
Total    
Fair value 322 109
Unrealized loss (10) (3)
Asset-backed Securities [Member]    
Less than 12 months    
Fair value 121 48
Unrealized loss (1) 0
12 months or more    
Fair Value 3 3
Unrealized loss 0 0
Total    
Fair value 124 51
Unrealized loss (1) 0
Foreign government securities [Member]    
Less than 12 months    
Fair value 102 20
Unrealized loss (3) 0
12 months or more    
Fair Value 112 140
Unrealized loss (19) (17)
Total    
Fair value 214 160
Unrealized loss $ (22) $ (17)