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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Jun. 30, 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 | $ 10,065 | $ 17,813
Greater Than Twelve Months | 3,063 | 4,155
Continuous Unrealized Loss Position, Total | 13,128 | 21,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 279 | 659
Greater Than Twelve Months | 339 | 507
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 618 | $ 1,166
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1,155 | 1,744
Equity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 10 | $ 4
Greater Than Twelve Months | 15 | 44
Continuous Unrealized Loss Position, Total | 25 | 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 4 | 2
Greater Than Twelve Months | 1 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5 | 4
Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 10,055 | 17,809
Greater Than Twelve Months | 3,048 | 4,111
Continuous Unrealized Loss Position, Total | 13,103 | 21,920
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 275 | 657
Greater Than Twelve Months | 338 | 505
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 613 | 1,162
Corporate bonds [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 8,521 | 15,820
Greater Than Twelve Months | 2,417 | 3,187
Continuous Unrealized Loss Position, Total | 10,938 | 19,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 223 | 569
Greater Than Twelve Months | 279 | 403
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 502 | 972
ABS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 84 | 201
Greater Than Twelve Months | 260 | 298
Continuous Unrealized Loss Position, Total | 344 | 499
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 4
Greater Than Twelve Months | 21 | 25
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 24 | 29
U.S. government bonds [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 172 | 18
Continuous Unrealized Loss Position, Total | 172 | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2 | 2
Foreign government bonds [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months |  | 29
Continuous Unrealized Loss Position, Total |  | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | 1
RMBS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 805 | 989
Greater Than Twelve Months | 146 | 392
Continuous Unrealized Loss Position, Total | 951 | 1,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 35 | 58
Greater Than Twelve Months | 5 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 40 | 81
CMBS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 92 | 190
Greater Than Twelve Months | 8 | 19
Continuous Unrealized Loss Position, Total | 100 | 209
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 4
Greater Than Twelve Months | 2 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 4 | 6
CLOs [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 227 | 259
Greater Than Twelve Months | 19 | 25
Continuous Unrealized Loss Position, Total | 246 | 284
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2 | 3
State and municipal bonds [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 132 | 227
Greater Than Twelve Months | 47 | 47
Continuous Unrealized Loss Position, Total | 179 | 274
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 7 | 12
Greater Than Twelve Months | 5 | 8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 12 | 20
Hybrid and redeemable preferred securities [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 22 | 76
Greater Than Twelve Months | 151 | 143
Continuous Unrealized Loss Position, Total | 173 | 219
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 | 26 | 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 27 | $ 48

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