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Fair Value of Assets and Liabilities - Quantitative information about the significant unobservable inputs used in level 3 fair value measurements (Details) - Equity-indexed and forward starting options in life and annuity product contracts - Significant unobservable inputs (Level 3) $ in Millions | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Quantitative information about the significant unobservable inputs |  |
Fair value | $ (401) | $ (185)
Projected option cost | Weighted Average |  |
Quantitative information about the significant unobservable inputs |  |
Measurement Input | 0.0261 | 0.0174
Projected option cost | Maximum |  |
Quantitative information about the significant unobservable inputs |  |
Measurement Input | 0.042 | 0.022
Projected option cost | Minimum |  |
Quantitative information about the significant unobservable inputs |  |
Measurement Input | 0.010 | 0.010

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- Definition Value of input used to measure net embedded derivative asset (liability). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Details
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