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Investments - Investments - Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost $ 40,174 $ 35,603
Gross Unrealized Gains, fixed maturities, available-for-sale 2,269 703
Gross Unrealized Losses, fixed maturities, available-for-sale (54) (654)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 42,389 35,652
Non-Credit OTTI (4) (5)
Amortized Cost    
One year or less 1,226 999
Over one year through five years 7,144 5,786
Over five years through ten years 7,405 6,611
Over ten years 12,229 12,629
Subtotal 28,004 26,025
Mortgage-backed and asset-backed securities 12,170 9,578
Fair Value    
One year or less 1,233 1,002
Over one year through five years 7,333 5,791
Over five years through ten years 7,812 6,495
Over ten years 13,530 12,820
Subtotal 29,908 26,108
Mortgage-backed and asset-backed securities 12,481 9,544
ABS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,315 1,272
Gross Unrealized Gains, fixed maturities, available-for-sale 23 5
Gross Unrealized Losses, fixed maturities, available-for-sale (1) (1)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 1,337 1,276
Non-Credit OTTI 0 0
CLOs    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 2,162 1,455
Gross Unrealized Gains, fixed maturities, available-for-sale 4 2
Gross Unrealized Losses, fixed maturities, available-for-sale (8) (20)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 2,158 1,437
Non-Credit OTTI 0 0
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 4,067 3,581
Gross Unrealized Gains, fixed maturities, available-for-sale 193 35
Gross Unrealized Losses, fixed maturities, available-for-sale (6) (64)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 4,254 3,552
Non-Credit OTTI (4) (5)
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 16,867 13,696
Gross Unrealized Gains, fixed maturities, available-for-sale 970 148
Gross Unrealized Losses, fixed maturities, available-for-sale (36) (446)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 17,801 13,398
Non-Credit OTTI 0 0
Foreign Govt./Govt. Agencies    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 1,053 866
Gross Unrealized Gains, fixed maturities, available-for-sale 65 7
Gross Unrealized Losses, fixed maturities, available-for-sale (1) (26)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 1,117 847
Non-Credit OTTI 0 0
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 9,095 9,972
Gross Unrealized Gains, fixed maturities, available-for-sale 801 421
Gross Unrealized Losses, fixed maturities, available-for-sale (1) (47)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 9,895 10,346
Non-Credit OTTI 0 0
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 4,626 3,270
Gross Unrealized Gains, fixed maturities, available-for-sale 107 44
Gross Unrealized Losses, fixed maturities, available-for-sale (1) (35)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 4,732 3,279
Non-Credit OTTI 0 0
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, available-for-sale, at fair value, amortized cost 989 1,491
Gross Unrealized Gains, fixed maturities, available-for-sale 106 41
Gross Unrealized Losses, fixed maturities, available-for-sale 0 (15)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) 1,095 1,517
Non-Credit OTTI $ 0 $ 0