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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Total number of AFS securities in an unrealized loss position | security | 684 | 3,414
Fixed Maturity AFS Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 2,965 | $ 35,246
Greater Than Twelve Months | 2,149 | 8,671
Fair Value - Total | 5,114 | 43,917
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 45 | 1,589
Greater Than Twelve Months | 224 | 856
Gross Unrealized Losses - Total | 269 | 2,445
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 | 1,743 | 32,493
Greater Than Twelve Months | 1,735 | 7,228
Fair Value - Total | 3,478 | 39,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 39 | 1,530
Greater Than Twelve Months | 190 | 735
Gross Unrealized Losses - Total | 229 | 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 | 846 | 1,241
Greater Than Twelve Months | 278 | 246
Fair Value - Total | 1,124 | 1,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 23
Greater Than Twelve Months | 9 | 17
Gross Unrealized Losses - Total | 12 | 40
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 |  | 70
Greater Than Twelve Months |  | 23
Fair Value - Total |  | 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
Gross Unrealized Losses - Total |  | 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 | 238 | 472
Greater Than Twelve Months | 19 | 863
Fair Value - Total | 257 | 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 | 1 | 60
Gross Unrealized Losses - Total | 2 | 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 |  | 470
Greater Than Twelve Months |  | 82
Fair Value - Total |  | 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 |  | 5
Gross Unrealized Losses - Total |  | 16
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 | 138 | 404
Greater Than Twelve Months | 4 | 96
Fair Value - Total | 142 | 500
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 8
Greater Than Twelve Months |  | 10
Gross Unrealized Losses - Total | 2 | 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 |  | 96
Greater Than Twelve Months | 113 | 133
Fair Value - Total | 113 | 229
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 6
Greater Than Twelve Months | 24 | 28
Gross Unrealized Losses - Total | $ 24 | $ 34

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