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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Unrealized Losses    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 906  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 96.00%  
ABS    
Amortized Cost    
Less Than 12 Months $ 90 $ 566
12 Months or More 29 113
Total 119 679
Fair Value    
Less Than 12 Months 90 566
12 Months or More 29 112
Total 119 678
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 0 (1)
Total 0 (1)
CLOs    
Amortized Cost    
Less Than 12 Months 1,229 1,358
12 Months or More 155 7
Total 1,384 1,365
Fair Value    
Less Than 12 Months 1,223 1,338
12 Months or More 153 7
Total 1,376 1,345
Unrealized Losses    
Less Than 12 Months (6) (20)
12 Months or More (2) 0
Total (8) (20)
CMBS    
Amortized Cost    
Less Than 12 Months 49 896
12 Months or More 372 1,129
Total 421 2,025
Fair Value    
Less Than 12 Months 48 882
12 Months or More 365 1,079
Total 413 1,961
Unrealized Losses    
Less Than 12 Months (1) (14)
12 Months or More (7) (50)
Total (8) (64)
Corporate    
Amortized Cost    
Less Than 12 Months 315 7,174
12 Months or More 1,504 2,541
Total 1,819 9,715
Fair Value    
Less Than 12 Months 309 6,903
12 Months or More 1,462 2,366
Total 1,771 9,269
Unrealized Losses    
Less Than 12 Months (6) (271)
12 Months or More (42) (175)
Total (48) (446)
Foreign Govt./Govt. Agencies    
Amortized Cost    
Less Than 12 Months 23 407
12 Months or More 62 203
Total 85 610
Fair Value    
Less Than 12 Months 23 391
12 Months or More 61 193
Total 84 584
Unrealized Losses    
Less Than 12 Months 0 (16)
12 Months or More (1) (10)
Total (1) (26)
Municipal    
Amortized Cost    
Less Than 12 Months 36 1,643
12 Months or More 7 292
Total 43 1,935
Fair Value    
Less Than 12 Months 36 1,613
12 Months or More 7 275
Total 43 1,888
Unrealized Losses    
Less Than 12 Months 0 (30)
12 Months or More 0 (17)
Total 0 (47)
RMBS    
Amortized Cost    
Less Than 12 Months 90 1,344
12 Months or More 356 648
Total 446 1,992
Fair Value    
Less Than 12 Months 90 1,329
12 Months or More 354 628
Total 444 1,957
Unrealized Losses    
Less Than 12 Months 0 (15)
12 Months or More (2) (20)
Total (2) (35)
U.S. Treasuries    
Amortized Cost    
Less Than 12 Months 16 497
12 Months or More 163 339
Total 179 836
Fair Value    
Less Than 12 Months 16 492
12 Months or More 162 329
Total 178 821
Unrealized Losses    
Less Than 12 Months 0 (5)
12 Months or More (1) (10)
Total (1) (15)
Available-for-sale Securities [Member]    
Amortized Cost    
Less Than 12 Months 1,848 13,885
12 Months or More 2,648 5,272
Total 4,496 19,157
Fair Value    
Less Than 12 Months 1,835 13,514
12 Months or More 2,593 4,989
Total 4,428 18,503
Unrealized Losses    
Less Than 12 Months (13) (371)
12 Months or More (55) (283)
Total $ (68) $ (654)