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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Dec. 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 | $ 5,673 | $ 35,246
Greater Than Twelve Months | 1,848 | 8,671
Fair Value - Total | 7,521 | 43,917
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 73 | 1,589
Greater Than Twelve Months | 170 | 856
Gross Unrealized Losses - Total | $ 243 | $ 2,445
Total number of AFS securities in an unrealized loss position | security | 895 | 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 | $ 2,935 | $ 32,493
Greater Than Twelve Months | 1,406 | 7,228
Fair Value - Total | 4,341 | 39,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 46 | 1,530
Greater Than Twelve Months | 141 | 735
Gross Unrealized Losses - Total | 187 | 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 | 1,792 | 1,241
Greater Than Twelve Months | 303 | 246
Fair Value - Total | 2,095 | 1,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 8 | 23
Greater Than Twelve Months | 10 | 17
Gross Unrealized Losses - Total | 18 | 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 | 536 | 472
Greater Than Twelve Months | 15 | 863
Fair Value - Total | 551 | 1,335
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 10 | 10
Greater Than Twelve Months |  | 60
Gross Unrealized Losses - Total | 10 | 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 | 48 | 470
Greater Than Twelve Months | 4 | 82
Fair Value - Total | 52 | 552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 11
Greater Than Twelve Months |  | 5
Gross Unrealized Losses - Total | 1 | 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 | 333 | 404
Greater Than Twelve Months | 18 | 96
Fair Value - Total | 351 | 500
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 7 | 8
Greater Than Twelve Months |  | 10
Gross Unrealized Losses - Total | 7 | 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 | 29 | 96
Greater Than Twelve Months | 102 | 133
Fair Value - Total | 131 | 229
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 6
Greater Than Twelve Months | 19 | 28
Gross Unrealized Losses - Total | $ 20 | $ 34

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