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Fair Value of Assets and Liabilities - Quantitative information about Level 3 instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Quantitative information about the significant unobservable inputs |  |
Fixed income securities | $ 58,992 | $ 57,839
Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Stochastic cash flow model |  |
Quantitative information about the significant unobservable inputs |  |
Weighted average projected option cost | 1.74% | 1.75%
Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Minimum | Stochastic cash flow model |  |
Quantitative information about the significant unobservable inputs |  |
Projected option cost | 1.00% | 1.00%
Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Maximum | Stochastic cash flow model |  |
Quantitative information about the significant unobservable inputs |  |
Projected option cost | 2.20% | 2.20%
Fixed income securities - non-binding broker quotes |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | $ 271 | $ 307
Municipal - not rated by third party credit rating agencies |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | 58 | 80
Significant unobservable inputs (Level 3) |  |
Quantitative information about the significant unobservable inputs |  |
Assets, fair value disclosure | 840 | 762
Significant unobservable inputs (Level 3) | Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options | Stochastic cash flow model |  |
Quantitative information about the significant unobservable inputs |  |
Liabilities at fair value | (252) | (247)
Recurring | Significant unobservable inputs (Level 3) |  |
Quantitative information about the significant unobservable inputs |  |
Liabilities at fair value | (286) | (293)
Fixed income securities | 606 | 558
Assets, fair value disclosure | $ 837 | $ 738

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- Definition Represents the weighted average percentage of projected option cost as an input to measure fair value. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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