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Investments (Details 13) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | $ 4,322 | $ 4,486
Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 4,268 | 4,442
Variable rate mortgage loans | 39 | 39
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 4,307 | 4,481
Below 1.0 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 4 | 60
Variable rate mortgage loans | 0 | 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 4 | 60
1.0 - 1.25 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 349 | 324
Variable rate mortgage loans | 0 | 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 349 | 324
1.26 - 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 1,111 | 1,293
Variable rate mortgage loans | 0 | 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 1,111 | 1,293
Above 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 2,804 | 2,765
Variable rate mortgage loans | 39 | 39
Mortgage Loans on Real Estate, Commercial and Consumer, Net | $ 2,843 | $ 2,804

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- Definition Amount of loan with fixed rate of interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + 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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