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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions | Jun. 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 | $ 32,167 | $ 5,844
Greater Than Twelve Months | 5,590 | 6,063
Fair Value - Total | 37,757 | 11,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1,130 | 89
Greater Than Twelve Months | 620 | 374
Losses - Total | $ 1,750 | $ 463
Total number of AFS securities in an unrealized loss position | security | 3,092 | 1,128
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
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
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 | $ 29,697 | 4,854
Greater Than Twelve Months | 4,512 | 4,893
Fair Value - Total | 34,209 | 9,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1,070 | 68
Greater Than Twelve Months | 513 | 288
Losses - Total | 1,583 | 356
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 171 | 62
Greater Than Twelve Months | 135 | 151
Fair Value - Total | 306 | 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 1
Greater Than Twelve Months | 13 | 15
Losses - Total | 15 | 16
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 | 113 | 156
Greater Than Twelve Months | 18 | 19
Fair Value - Total | 131 | 175
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 |
Greater Than Twelve Months | 2 | 1
Losses - Total | 3 | 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 | 760 | 302
Greater Than Twelve Months | 607 | 641
Fair Value - Total | 1,367 | 943
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 27 | 4
Greater Than Twelve Months | 58 | 36
Losses - Total | 85 | 40
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 525 | 113
Greater Than Twelve Months | 58 | 60
Fair Value - Total | 583 | 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 16 |
Greater Than Twelve Months | 4 | 3
Losses - Total | 20 | 3
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 639 | 281
Greater Than Twelve Months | 57 | 72
Fair Value - Total | 696 | 353
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 7 | 2
Losses - Total | 7 | 2
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 | 215 | 34
Greater Than Twelve Months | 85 | 93
Fair Value - Total | 300 | 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 5 |
Greater Than Twelve Months | 9 | 6
Losses - Total | 14 | 6
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 | 47 | 20
Greater Than Twelve Months | 118 | 126
Fair Value - Total | 165 | 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 | 21 | 22
Losses - Total | $ 23 | $ 22

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