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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 36,894 | $ 5,844
Greater Than Twelve Months | 5,738 | 6,063
Fair Value - Total | 42,632 | 11,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1,287 | 89
Greater Than Twelve Months | 663 | 374
Losses - Total | $ 1,950 | $ 463
Total number of AFS securities in an unrealized loss position | security | 3,480 | 1,128
Fixed Maturity AFS Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months |  | $ 5,822
Greater Than Twelve Months |  | 6,055
Fair Value - Total |  | 11,877
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 75
Greater Than Twelve Months |  | 371
Losses - Total |  | 446
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 | $ 33,196 | 4,854
Greater Than Twelve Months | 4,690 | 4,893
Fair Value - Total | 37,886 | 9,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1,188 | 68
Greater Than Twelve Months | 538 | 288
Losses - Total | 1,726 | 356
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 252 | 62
Greater Than Twelve Months | 129 | 151
Fair Value - Total | 381 | 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 1
Greater Than Twelve Months | 12 | 15
Losses - Total | 15 | 16
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 | 169 | 156
Greater Than Twelve Months | 18 | 19
Fair Value - Total | 187 | 175
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 | 2 | 1
Losses - Total | 6 | 1
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 836 | 302
Greater Than Twelve Months | 603 | 641
Fair Value - Total | 1,439 | 943
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 43 | 4
Greater Than Twelve Months | 73 | 36
Losses - Total | 116 | 40
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 624 | 113
Greater Than Twelve Months | 57 | 60
Fair Value - Total | 681 | 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 18 |
Greater Than Twelve Months | 5 | 3
Losses - Total | 23 | 3
Fixed Maturity AFS Securities [Member] | CLOs [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 1,062 | 281
Greater Than Twelve Months | 34 | 72
Fair Value - Total | 1,096 | 353
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 14 | 2
Losses - Total | 14 | 2
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 | 724 | 34
Greater Than Twelve Months | 75 | 93
Fair Value - Total | 799 | 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 15 |
Greater Than Twelve Months | 11 | 6
Losses - Total | 26 | 6
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 | 31 | 20
Greater Than Twelve Months | 132 | 126
Fair Value - Total | 163 | 146
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 | 22 | 22
Losses - Total | $ 24 | 22
Equity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months |  | 22
Greater Than Twelve Months |  | 8
Fair Value - Total |  | 30
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months |  | 14
Greater Than Twelve Months |  | 3
Losses - Total |  | $ 17

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