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Fair Value of Assets and Liabilities - Quantitative information about Level 3 instruments (Details) $ in Millions | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Quantitative information about the significant unobservable inputs |  |
Fixed income securities | $ 57,170 | $ 58,992
Fixed income securities - non-binding broker quotes |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | 105 | 271
Municipal - not rated by third party credit rating agencies |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | 44 | 58
Significant unobservable inputs (Level 3) |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | 697 | 840
Recurring | Significant unobservable inputs (Level 3) |  |
Quantitative information about the significant unobservable inputs |  |
Fixed income securities | 325 | 606
Assets, fair value disclosure |  | 837
Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Significant unobservable inputs (Level 3) |  |
Quantitative information about the significant unobservable inputs |  |
Fair value | $ (185) | $ (252)
Projected option cost | Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Significant unobservable inputs (Level 3) | Weighted Average |  |
Quantitative information about the significant unobservable inputs |  |
Embedded Derivative Asset (Liability) Net, Measurement Input | 0.0174 | 0.0174
Projected option cost | Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Significant unobservable inputs (Level 3) | Minimum |  |
Quantitative information about the significant unobservable inputs |  |
Embedded Derivative Asset (Liability) Net, Measurement Input | 0.010 | 0.010
Projected option cost | Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Significant unobservable inputs (Level 3) | Maximum |  |
Quantitative information about the significant unobservable inputs |  |
Embedded Derivative Asset (Liability) Net, Measurement Input | 0.022 | 0.022

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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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