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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 5,915 | $ 35,246
Greater Than Twelve Months | 16,502 | 8,671
Fair Value - Total | 22,417 | 43,917
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 174 | 1,589
Greater Than Twelve Months | 786 | 856
Gross Unrealized Losses - Total | $ 960 | $ 2,445
Total number of AFS securities in an unrealized loss position | security | 1,881 | 3,414
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 4,831 | $ 32,493
Greater Than Twelve Months | 14,492 | 7,228
Fair Value - Total | 19,323 | 39,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 164 | 1,530
Greater Than Twelve Months | 692 | 735
Gross Unrealized Losses - Total | 856 | 2,265
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 74 | 117
Greater Than Twelve Months | 176 | 143
Fair Value - Total | 250 | 260
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 2
Greater Than Twelve Months | 13 | 14
Gross Unrealized Losses - Total | 14 | 16
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 6 | 70
Greater Than Twelve Months | 28 | 23
Fair Value - Total | 34 | 93
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 1
Greater Than Twelve Months | 1 | 1
Gross Unrealized Losses - Total | 1 | 2
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 55 | 472
Greater Than Twelve Months | 942 | 863
Fair Value - Total | 997 | 1,335
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 10
Greater Than Twelve Months | 42 | 60
Gross Unrealized Losses - Total | 43 | 70
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 10 | 470
Greater Than Twelve Months | 297 | 82
Fair Value - Total | 307 | 552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 11
Greater Than Twelve Months | 3 | 5
Gross Unrealized Losses - Total | 3 | 16
Fixed Maturity AFS Securities [Member] | CLOs [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 771 | 1,124
Greater Than Twelve Months | 281 | 103
Fair Value - Total | 1,052 | 1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 5 | 21
Greater Than Twelve Months | 6 | 3
Gross Unrealized Losses - Total | 11 | 24
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 156 | 404
Greater Than Twelve Months | 135 | 96
Fair Value - Total | 291 | 500
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 8
Greater Than Twelve Months | 7 | 10
Gross Unrealized Losses - Total | 8 | 18
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 12 | 96
Greater Than Twelve Months | 151 | 133
Fair Value - Total | 163 | 229
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 6
Greater Than Twelve Months | 22 | 28
Gross Unrealized Losses - Total | $ 24 | $ 34

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