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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
--- | --- | ---
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 5,844 | $ 17,813
Greater Than Twelve Months | 6,063 | 4,155
Fair Value - Total | 11,907 | 21,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 89 | 659
Greater Than Twelve Months | 374 | 507
Losses - Total | $ 463 | $ 1,166
Total number of AFS securities in an unrealized loss position | security | 1,128 | 1,744
Equity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 22 | $ 4
Greater Than Twelve Months | 8 | 44
Fair Value - Total | 30 | 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 14 | 2
Greater Than Twelve Months | 3 | 2
Losses - Total | 17 | 4
Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 5,822 | 17,809
Greater Than Twelve Months | 6,055 | 4,111
Fair Value - Total | 11,877 | 21,920
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 75 | 657
Greater Than Twelve Months | 371 | 505
Losses - Total | 446 | 1,162
Corporate Bonds [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 4,854 | 15,820
Greater Than Twelve Months | 4,893 | 3,187
Fair Value - Total | 9,747 | 19,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 68 | 569
Greater Than Twelve Months | 288 | 403
Losses - Total | 356 | 972
ABS [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 62 | 201
Greater Than Twelve Months | 151 | 298
Fair Value - Total | 213 | 499
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 4
Greater Than Twelve Months | 15 | 25
Losses - Total | 16 | 29
U.S. government bonds [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 156 | 18
Greater Than Twelve Months | 19 |
Fair Value - Total | 175 | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 2
Greater Than Twelve Months | 1 |
Losses - Total | 1 | 2
Foreign Government Bonds [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months |  | 29
Fair Value - Total |  | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 1
Losses - Total |  | 1
RMBS [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 302 | 989
Greater Than Twelve Months | 641 | 392
Fair Value - Total | 943 | 1,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 4 | 58
Greater Than Twelve Months | 36 | 23
Losses - Total | 40 | 81
CMBS [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 113 | 190
Greater Than Twelve Months | 60 | 19
Fair Value - Total | 173 | 209
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 4
Greater Than Twelve Months | 3 | 2
Losses - Total | 3 | 6
CLOs [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 281 | 259
Greater Than Twelve Months | 72 | 25
Fair Value - Total | 353 | 284
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 3
Losses - Total | 2 | 3
State and municipal bonds [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 34 | 227
Greater Than Twelve Months | 93 | 47
Fair Value - Total | 127 | 274
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 12
Greater Than Twelve Months | 6 | 8
Losses - Total | 6 | 20
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 20 | 76
Greater Than Twelve Months | 126 | 143
Fair Value - Total | 146 | 219
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 4
Greater Than Twelve Months | 22 | 44
Losses - Total | $ 22 | $ 48

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