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Investments - Continuous unrealized loss positions (Details)
$ in Millions
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
U.S. government and agencies    
Fixed income securities    
Number of issues | security 11 66
Fair value $ 55 $ 2,829
Unrealized losses $ 0 $ (18)
Fixed income securities    
Number of issues | security 38 18
Fair value $ 364 $ 182
Unrealized losses (6) (2)
Equity securities    
Total unrealized losses $ (6) $ (20)
Municipal    
Fixed income securities    
Number of issues | security 943 1,756
Fair value $ 1,633 $ 3,143
Unrealized losses $ (10) $ (24)
Fixed income securities    
Number of issues | security 1,147 165
Fair value $ 1,554 $ 349
Unrealized losses (33) (12)
Equity securities    
Total unrealized losses $ (43) $ (36)
Corporate    
Fixed income securities    
Number of issues | security 1,735 781
Fair value $ 19,243 $ 11,616
Unrealized losses $ (543) $ (102)
Fixed income securities    
Number of issues | security 645 208
Fair value $ 8,374 $ 3,289
Unrealized losses (347) (102)
Equity securities    
Total unrealized losses $ (890) $ (204)
Foreign government    
Fixed income securities    
Number of issues | security 7 45
Fair value $ 20 $ 580
Unrealized losses $ (1) $ (10)
Fixed income securities    
Number of issues | security 27 5
Fair value $ 412 $ 44
Unrealized losses (4) (1)
Equity securities    
Total unrealized losses $ (5) $ (11)
ABS    
Fixed income securities    
Number of issues | security 64 57
Fair value $ 454 $ 476
Unrealized losses $ (5) $ (3)
Fixed income securities    
Number of issues | security 28 9
Fair value $ 161 $ 34
Unrealized losses (5) (4)
Equity securities    
Total unrealized losses $ (10) $ (7)
RMBS    
Fixed income securities    
Number of issues | security 166 118
Fair value $ 30 $ 35
Unrealized losses $ 0 $ (1)
Fixed income securities    
Number of issues | security 195 181
Fair value $ 52 $ 50
Unrealized losses (2) (2)
Equity securities    
Total unrealized losses $ (2) $ (3)
CMBS    
Fixed income securities    
Number of issues | security 3 2
Fair value $ 7 $ 1
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 2 6
Fair value $ 0 $ 23
Unrealized losses (1) (2)
Equity securities    
Total unrealized losses $ (1) $ (2)
Redeemable preferred stock    
Fixed income securities    
Number of issues | security 1 1
Fair value $ 0 $ 0
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 0 0
Fair value $ 0 $ 0
Unrealized losses 0 0
Equity securities    
Total unrealized losses $ 0 $ 0
Fixed income securities    
Fixed income securities    
Number of issues | security 2,930 2,826
Fair value $ 21,442 $ 18,680
Unrealized losses $ (559) $ (158)
Fixed income securities    
Number of issues | security 2,082 592
Fair value $ 10,917 $ 3,971
Unrealized losses (398) (125)
Equity securities    
Total unrealized losses (957) $ (283)
Equity securities    
Equity securities    
Number of issues | security   127
Fair value   $ 369
Unrealized losses   $ (12)
Equity securities    
Number of issues | security   2
Fair value   $ 0
Unrealized losses   0
Total unrealized losses   $ (12)
Fixed income and equity securities    
Equity securities    
Number of issues | security   2,953
Fair value   $ 19,049
Unrealized losses   $ (170)
Equity securities    
Number of issues | security   594
Fair value   $ 3,971
Unrealized losses   (125)
Total unrealized losses $ (957) $ (295)
Investment grade fixed income securities    
Fixed income securities    
Number of issues | security 2,348 2,706
Fair value $ 17,485 $ 17,668
Unrealized losses $ (331) $ (134)
Fixed income securities    
Number of issues | security 2,021 535
Fair value $ 10,626 $ 3,751
Unrealized losses (360) (98)
Equity securities    
Total unrealized losses $ (691) $ (232)
Below investment grade fixed income securities    
Fixed income securities    
Number of issues | security 582 120
Fair value $ 3,957 $ 1,012
Unrealized losses $ (228) $ (24)
Fixed income securities    
Number of issues | security 61 57
Fair value $ 291 $ 220
Unrealized losses (38) (27)
Equity securities    
Total unrealized losses $ (266) $ (51)