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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Additional information (Details) - Group Insurance Policies [Member] - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development | $ (284) | $ (162)
Long-term Disability [Member] |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development | 195 | 105
group life term, disability and accident [Member] |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development | $ 85 | $ 55

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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, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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