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Investments and Cash - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Less than 12 months    
Fair value $ 3,450 $ 806
Unrealized loss (69) (10)
12 months or more    
Fair Value 1,081 975
Unrealized loss (94) (57)
Total    
Fair value 4,531 1,781
Unrealized loss $ (163) $ (67)
Number of securities    
Less than 12 months (in securities) | Security 1,003 244
12 months or more (in securities) | Security 311 264
Total (in securities) | Security 1,283 499
Number of securities with OTTI    
Less than 12 months (in securities) | Security 23 17
12 months or more (in securities) | Security 16 15
Total (in securities) | Security 39 31
Obligations of state and political subdivisions [Member]    
Less than 12 months    
Fair value $ 1,305 $ 166
Unrealized loss (25) (4)
12 months or more    
Fair Value 273 281
Unrealized loss (13) (7)
Total    
Fair value 1,578 447
Unrealized loss (38) (11)
US government and agencies [Member]    
Less than 12 months    
Fair value 20 151
Unrealized loss 0 0
12 months or more    
Fair Value 25 18
Unrealized loss (1) (1)
Total    
Fair value 45 169
Unrealized loss (1) (1)
Corporate securities [Member]    
Less than 12 months    
Fair value 1,144 201
Unrealized loss (26) (1)
12 months or more    
Fair Value 260 240
Unrealized loss (29) (17)
Total    
Fair value 1,404 441
Unrealized loss (55) (18)
RMBS [Member]    
Less than 12 months    
Fair value 386 191
Unrealized loss (8) (5)
12 months or more    
Fair Value 331 213
Unrealized loss (27) (12)
Total    
Fair value 717 404
Unrealized loss (35) (17)
CMBS [Member]    
Less than 12 months    
Fair value 229 29
Unrealized loss (5) 0
12 months or more    
Fair Value 80 80
Unrealized loss (6) (3)
Total    
Fair value 309 109
Unrealized loss (11) (3)
Asset-backed Securities [Member]    
Less than 12 months    
Fair value 280 48
Unrealized loss (1) 0
12 months or more    
Fair Value 11 3
Unrealized loss (1) 0
Total    
Fair value 291 51
Unrealized loss (2) 0
Foreign government securities [Member]    
Less than 12 months    
Fair value 86 20
Unrealized loss (4) 0
12 months or more    
Fair Value 101 140
Unrealized loss (17) (17)
Total    
Fair value 187 160
Unrealized loss $ (21) $ (17)