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Investments (Schedule Of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | $ 484 | $ 666 |  |
Net Unrealized Gain/(Loss) Position | 63 | 29 |  |
Fair Value | 547 | 695 |  |
OTTI in Credit Losses | 378 | 430 | $ 382 | $ 380
Corporate Bonds [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | 17 | 80 |  |
Net Unrealized Gain/(Loss) Position | 7 | 5 |  |
Fair Value | 24 | 85 |  |
OTTI in Credit Losses | 31 | 77 |  |
ABS [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | 182 | 212 |  |
Net Unrealized Gain/(Loss) Position | 27 | 13 |  |
Fair Value | 209 | 225 |  |
OTTI in Credit Losses | 109 | 112 |  |
RMBS [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | 260 | 332 |  |
Net Unrealized Gain/(Loss) Position | 22 | 6 |  |
Fair Value | 282 | 338 |  |
OTTI in Credit Losses | 189 | 194 |  |
CMBS [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | 14 | 29 |  |
Net Unrealized Gain/(Loss) Position | 2 | 1 |  |
Fair Value | 16 | 30 |  |
OTTI in Credit Losses | 41 | 39 |  |
CLOs [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost | 11 | 11 |  |
Net Unrealized Gain/(Loss) Position | 5 | 4 |  |
Fair Value | 16 | 15 |  |
OTTI in Credit Losses | 5 | 5 |  |
State and municipal bonds [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Amortized Cost |  | 2 |  |
Fair Value |  | 2 |  |
OTTI in Credit Losses | $ 3 | $ 3 |  |

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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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