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Investments (Credit Loss Expense Incurred) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Gross credit loss expense recognized in net income (loss) | $ (20) | $ (8)
Net credit loss expense recognized in net income (loss) | (20) | (8)
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Gross credit loss expense recognized in net income (loss) | (20) | (6)
Net credit loss expense recognized in net income (loss) | $ (20) |
RMBS [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Gross credit loss expense recognized in net income (loss) |  | (1)
ABS [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Gross credit loss expense recognized in net income (loss) |  | $ (1)

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- Definition Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded, Before associated amortization. + References No definition available. + Details
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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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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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