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Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
OTTI Recognized in Net Income (Loss) |  |  |  |
Gross OTTI recognized in net income (loss) | $ (1) | $ (4) | $ (3) | $ (8)
Net OTTI recognized in net income (loss), pre-tax | (1) | (4) | (3) | (8)
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |  |
OTTI Recognized in Net Income (Loss) |  |  |  |
Gross OTTI recognized in net income (loss) | $ (1) | $ (4) | $ (3) | (5)
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |  |
OTTI Recognized in Net Income (Loss) |  |  |  |
Gross OTTI recognized in net income (loss) |  |  |  | (1)
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |  |
OTTI Recognized in Net Income (Loss) |  |  |  |
Gross OTTI recognized in net income (loss) |  |  |  | (1)
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member] |  |  |  |
OTTI Recognized in Net Income (Loss) |  |  |  |
Gross OTTI recognized in net income (loss) |  |  |  | $ (1)

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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