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Investments - Carrying value of non-impaired mortgage loans summarized by debt service coverage ratio distribution (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total | $ 4,681 | $ 4,670
Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 4,545 | 4,534
Variable rate mortgage loans | 132 | 132
Total | 4,677 | 4,666
Below 1.0 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 22 | 6
Variable rate mortgage loans | 31 | 31
Total | 53 | 37
1.0 - 1.25 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 256 | 273
Variable rate mortgage loans | 0 | 0
Total | 256 | 273
1.26 - 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 1,157 | 1,192
Variable rate mortgage loans | 0 | 0
Total | 1,157 | 1,192
Above 1.50 | Mortgage loans, non-impaired |  |
Financing Receivable, Impaired [Line Items] |  |
Fixed rate mortgage loans | 3,110 | 3,063
Variable rate mortgage loans | 101 | 101
Total | $ 3,211 | $ 3,164

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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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