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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Current | $ 10,378 |  | $ 9,888 |  |  |
Greater than 90 days past due | 6 |  | 2 |  |  |
Valuation allowance associated with impaired mortgage loans on real estate | (2) | $ (2) | (2) | $ (3) | $ (2) | $ (2)
Unamortized premium (discount) |  |  | 1 |  |  |
Total carrying value | $ 10,382 |  | $ 9,889 |  |  |

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- Definition Mortgage loans on real estate that are current. + References No definition available. + Details
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- Definition Mortgage loans on real estate that are greater than 90 days past due. + References No definition available. + Details
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- Definition The amount of premium (net of discount) that was originally recognized at the issuance of the mortgage loan that has yet to be amortized. + References No definition available. + Details
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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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