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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Sep. 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 | $ 9,089 | $ 17,813
Greater Than Twelve Months | 2,760 | 4,155
Fair Value - Total | 11,849 | 21,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 258 | 659
Greater Than Twelve Months | 274 | 507
Losses - Total | $ 532 | $ 1,166
Total number of AFS securities in an unrealized loss position | security | 1,052 | 1,744
Equity AFS securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 26 | $ 4
Greater Than Twelve Months | 8 | 44
Fair Value - Total | 34 | 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 11 | 2
Greater Than Twelve Months | 2 | 2
Losses - Total | 13 | 4
Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 9,063 | 17,809
Greater Than Twelve Months | 2,752 | 4,111
Fair Value - Total | 11,815 | 21,920
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 247 | 657
Greater Than Twelve Months | 272 | 505
Losses - Total | 519 | 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 | 7,624 | 15,820
Greater Than Twelve Months | 2,273 | 3,187
Fair Value - Total | 9,897 | 19,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 206 | 569
Greater Than Twelve Months | 218 | 403
Losses - Total | 424 | 972
ABS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 88 | 201
Greater Than Twelve Months | 156 | 298
Fair Value - Total | 244 | 499
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 | 17 | 25
Losses - Total | 19 | 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
Fair Value - 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
Losses - Total | 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
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 securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 770 | 989
Greater Than Twelve Months | 128 | 392
Fair Value - Total | 898 | 1,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 31 | 58
Greater Than Twelve Months | 8 | 23
Losses - Total | 39 | 81
CMBS [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 126 | 190
Greater Than Twelve Months | 7 | 19
Fair Value - Total | 133 | 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 | 1 | 2
Losses - Total | 3 | 6
CLOs [Member] | Fixed maturity securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 175 | 259
Greater Than Twelve Months | 6 | 25
Fair Value - Total | 181 | 284
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 3
Losses - Total | 1 | 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 | 88 | 227
Greater Than Twelve Months | 57 | 47
Fair Value - Total | 145 | 274
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 12
Greater Than Twelve Months | 5 | 8
Losses - Total | 8 | 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 | 20 | 76
Greater Than Twelve Months | 125 | 143
Fair Value - Total | 145 | 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 | 23 | 44
Losses - Total | $ 23 | $ 48

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