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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Fair value | $ 56,891,000,000 |  | $ 56,891,000,000 |  | $ 58,992,000,000
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities | 12,000,000 | $ 9,000,000 | 39,000,000 | $ 23,000,000 |
Significant unobservable inputs (Level 3) |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Assets at fair value | 785,000,000 |  | 785,000,000 |  | 840,000,000
Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Fair value | 485,000,000 |  | 485,000,000 |  | 606,000,000
Assets at fair value | 777,000,000 |  | 777,000,000 |  | 837,000,000
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Assets at fair value | 251,000,000 |  | 251,000,000 |  | 271,000,000
Municipal Not Rated by Third Party Credit Rating Agencies |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Assets at fair value | 57,000,000 |  | 57,000,000 |  | $ 58,000,000
Gain (Loss) on Investments |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities | 14,000,000 | 3,000,000 | 39,000,000 | 16,000,000 |
Realized capital gains and losses |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Change in unrealized gain (loss) | 13,000,000 | (1,000,000) | 15,000,000 |  |
Interest credited to contractholder funds |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Change in unrealized gain (loss) |  | (1,000,000) | 19,000,000 | (6,000,000) |
Life contract benefits |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Change in unrealized gain (loss) | 1,000,000 | 1,000,000 | 5,000,000 | 8,000,000 |
(Loss) gain reclassified from AOCI into income (net investment income) |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Change in unrealized gain (loss) |  | $ 4,000,000 |  | $ 14,000,000 |
Limited partnership interests |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Commitments to invest in limited partnership interests | $ 866,000,000 |  | $ 866,000,000 |  |
Limited partnership interests | Minimum |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Investment assets, useful life |  |  | 10 years |  |
Limited partnership interests | Maximum |  |  |  |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |  |  |  |
Investment assets, useful life |  |  | 12 years |  |

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- Definition This element represents commitments to acquire financial interests or instruments, to allow for additional participation in certain limited partnership investments. Because the equity investments in the limited partnerships are not actively traded, it is not practical to estimate the fair value of these commitments. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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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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