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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 | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | $ 514 | $ 666 |  |  |  |
Net Unrealized Gain/(Loss) Position | 57 | 29 |  |  |  |
Fair Value | 571 | 695 |  |  |  |
OTTI in Credit Losses | 378 | 430 | $ 390 | $ 436 | $ 431 | $ 382
Corporate bonds [Member] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | 20 | 80 |  |  |  |
Net Unrealized Gain/(Loss) Position | 5 | 5 |  |  |  |
Fair Value | 25 | 85 |  |  |  |
OTTI in Credit Losses | 32 | 77 |  |  |  |
ABS [Member] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | 193 | 212 |  |  |  |
Net Unrealized Gain/(Loss) Position | 23 | 13 |  |  |  |
Fair Value | 216 | 225 |  |  |  |
OTTI in Credit Losses | 111 | 112 |  |  |  |
RMBS [Member] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | 275 | 332 |  |  |  |
Net Unrealized Gain/(Loss) Position | 22 | 6 |  |  |  |
Fair Value | 297 | 338 |  |  |  |
OTTI in Credit Losses | 188 | 194 |  |  |  |
CMBS [Member] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | 15 | 29 |  |  |  |
Net Unrealized Gain/(Loss) Position | 3 | 1 |  |  |  |
Fair Value | 18 | 30 |  |  |  |
OTTI in Credit Losses | 39 | 39 |  |  |  |
CLOs [Member] |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |
Amortized Cost | 11 | 11 |  |  |  |
Net Unrealized Gain/(Loss) Position | 4 | 4 |  |  |  |
Fair Value | 15 | 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 |  |  |  |

X
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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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