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Investments Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Mortgage loans | $ 1,338 | $ 1,361
Category 1 [Member] |  |
Mortgage loans | 41 | 42
Category 2 to 4 [Member] |  |
Mortgage loans | 1,283 | 1,301
Categories 5 and 6 [Member] |  |
Mortgage loans | 14 | 18
Category 7 [Member] |  |
Mortgage loans | $ 0 | $ 0

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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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- Details
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- Details
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- Details
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- Details
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- Details
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