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Investments - Carrying value of non-impaired mortgage loans summarized by debt service coverage ratio distribution (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | $ 4,535 | $ 4,534
Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 4,400 | 4,438
Variable rate mortgage loans | 131 | 92
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 4,531 | 4,530
Below 1.0 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 3 | 3
Variable rate mortgage loans | 30 | 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 33 | 3
1.0 - 1.25 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 324 | 345
Variable rate mortgage loans | 0 | 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 324 | 345
1.26 - 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 1,164 | 1,141
Variable rate mortgage loans | 0 | 30
Mortgage Loans on Real Estate, Commercial and Consumer, Net | 1,164 | 1,171
Above 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 2,909 | 2,949
Variable rate mortgage loans | 101 | 62
Mortgage Loans on Real Estate, Commercial and Consumer, Net | $ 3,010 | $ 3,011

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- Definition Amount of loan with fixed rate of interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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