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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Mortgage loans | $ 1,345 | $ 1,361
Category 1 |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Mortgage loans | 45 | 42
Category 2 to 4 |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Mortgage loans | 1,288 | 1,301
Categories 5 and 6 |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Mortgage loans | 12 | 18
Category 7 |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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