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Investments (Credit Quality Indicators For Mortgage Loans) (Details) $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 10,762 | $ 9,889
Percentage of total mortgage loans on real estate | 100.00% | 100.00%
Loan-to-value ratio, less than 65% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 9,642 | $ 8,709
Percentage of total mortgage loans on real estate | 89.60% | 88.00%
Debt-service coverage ratio | 2.26 | 2.16
Loan-to-value ratio, 65% to 74% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 1,000 | $ 1,009
Percentage of total mortgage loans on real estate | 9.30% | 10.20%
Debt-service coverage ratio | 1.94 | 1.87
Loan-to-value ratio, 75% to 100% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 112 | $ 166
Percentage of total mortgage loans on real estate | 1.00% | 1.70%
Debt-service coverage ratio | 0.97 | 0.82
Loan-To-Value Ratio, Greater Than 100% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 8 | $ 5
Percentage of total mortgage loans on real estate | 0.10% | 0.10%
Debt-service coverage ratio | 0.82 | 1.04

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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