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Investments - Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost $ 35,612 $ 31,296
Gross Unrealized Gains, fixed maturities, available-for-sale 1,466 1,188
Gross Unrealized Losses, fixed maturities, available-for-sale (114) (302)
Total fixed maturities 36,964 32,182
Non-Credit OTTI (5) (5)
Equity securities, available-for-sale, Cost or Amortized Cost 907 878
Equity securities, AFS 1,012 945
Available-for-sale, Cost or Amortized Cost 36,519 32,174
Available-for-sale, Gross Unrealized Gains 1,587 1,272
Available-for-sale, Gross Unrealized Losses (130) (319)
Available-for-sale, Fair Value 37,976 33,127
Amortized Cost    
One year or less 1,507 1,174
Over one year through five years 5,007 4,830
Over five years through ten years 6,505 5,476
Over ten years 13,928 11,704
Subtotal 26,947 23,184
Mortgage-backed and asset-backed securities 8,665 8,112
Fair Value    
One year or less 1,513 1,185
Over one year through five years 5,119 4,987
Over five years through ten years 6,700 5,596
Over ten years 14,866 12,253
Subtotal 28,198 24,021
Mortgage-backed and asset-backed securities 8,766 8,161
ABS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,119 1,385
Gross Unrealized Gains, fixed maturities, available-for-sale 9 8
Gross Unrealized Losses, fixed maturities, available-for-sale (2) (4)
Total fixed maturities 1,126 1,389
Non-Credit OTTI 0 0
CDOs    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,257 960
Gross Unrealized Gains, fixed maturities, available-for-sale 3 18
Gross Unrealized Losses, fixed maturities, available-for-sale 0 (2)
Total fixed maturities 1,260 976
Non-Credit OTTI 0 0
CMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 3,304 2,772
Gross Unrealized Gains, fixed maturities, available-for-sale 58 52
Gross Unrealized Losses, fixed maturities, available-for-sale (26) (34)
Total fixed maturities 3,336 2,790
Non-Credit OTTI (5) (5)
Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 12,370 10,703
Gross Unrealized Gains, fixed maturities, available-for-sale 490 399
Gross Unrealized Losses, fixed maturities, available-for-sale (56) (129)
Total fixed maturities 12,804 10,973
Non-Credit OTTI 0 0
Foreign government/government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,071 827
Gross Unrealized Gains, fixed maturities, available-for-sale 43 15
Gross Unrealized Losses, fixed maturities, available-for-sale (4) (16)
Total fixed maturities 1,110 826
Non-Credit OTTI 0 0
Municipal    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 11,743 9,727
Gross Unrealized Gains, fixed maturities, available-for-sale 754 635
Gross Unrealized Losses, fixed maturities, available-for-sale (12) (65)
Total fixed maturities 12,485 10,297
Non-Credit OTTI 0 0
RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 2,985 2,995
Gross Unrealized Gains, fixed maturities, available-for-sale 63 32
Gross Unrealized Losses, fixed maturities, available-for-sale (4) (21)
Total fixed maturities 3,044 3,006
Non-Credit OTTI 0 0
U.S. Treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,763 1,927
Gross Unrealized Gains, fixed maturities, available-for-sale 46 29
Gross Unrealized Losses, fixed maturities, available-for-sale (10) (31)
Total fixed maturities 1,799 1,925
Non-Credit OTTI 0 0
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Non-Credit OTTI 0 0
Equity securities, available-for-sale, Cost or Amortized Cost 907 878
Gross Unrealized Gains, fixed maturities, available-for-sale 121 84
Gross Unrealized Losses Gains, fixed maturities, available-for-sale (16) (17)
Equity securities, AFS $ 1,012 $ 945