Business, Basis of Presentation and Summary of Significant Accounting Policies- Discontinued Operations (Details)	Aug. 04, 2017 shares
Brighthouse Financial, Inc [Member] \| Impact of Separation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common Stock, Shares, Issued	96,776,670

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.

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