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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 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 | $ 16,142 | $ 17,813
Greater Than Twelve Months | 3,651 | 4,155
Continuous Unrealized Loss Position, Total | 19,793 | 21,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 553 | 659
Greater Than Twelve Months | 385 | 507
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 938 | $ 1,166
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1,584 | 1,744
Equity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 13 | $ 4
Greater Than Twelve Months | 40 | 44
Continuous Unrealized Loss Position, Total | 53 | 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 2
Greater Than Twelve Months | 1 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3 | 4
Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 16,129 | 17,809
Greater Than Twelve Months | 3,611 | 4,111
Continuous Unrealized Loss Position, Total | 19,740 | 21,920
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 551 | 657
Greater Than Twelve Months | 384 | 505
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 935 | 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 | 14,068 | 15,820
Greater Than Twelve Months | 2,790 | 3,187
Continuous Unrealized Loss Position, Total | 16,858 | 19,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 471 | 569
Greater Than Twelve Months | 302 | 403
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 773 | 972
ABS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 121 | 201
Greater Than Twelve Months | 270 | 298
Continuous Unrealized Loss Position, Total | 391 | 499
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 4 | 4
Greater Than Twelve Months | 22 | 25
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 26 | 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 | 170 | 18
Continuous Unrealized Loss Position, Total | 170 | 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 | 996 | 989
Greater Than Twelve Months | 325 | 392
Continuous Unrealized Loss Position, Total | 1,321 | 1,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 52 | 58
Greater Than Twelve Months | 15 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 67 | 81
CMBS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 210 | 190
Greater Than Twelve Months | 18 | 19
Continuous Unrealized Loss Position, Total | 228 | 209
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 4 | 4
Greater Than Twelve Months | 2 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 6 | 6
CLOs [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 277 | 259
Greater Than Twelve Months | 21 | 25
Continuous Unrealized Loss Position, Total | 298 | 284
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3 | 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 | 231 | 227
Greater Than Twelve Months | 46 | 47
Continuous Unrealized Loss Position, Total | 277 | 274
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 12 | 12
Greater Than Twelve Months | 6 | 8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 18 | 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 | 56 | 76
Greater Than Twelve Months | 141 | 143
Continuous Unrealized Loss Position, Total | 197 | 219
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 | 37 | 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 40 | $ 48

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