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Fair Value Measurements - Changes in Unrealized Gains (Losses) Included in Net Income for Financial Instruments Classified as Level 3 Still Held at Year End (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (1) | $ (4) | $ 1 | $ (5)
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | (4) | (1) | (2) | (2)
Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | (4) | (1) | (2) | (2)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | (1) | (4) | 1 | (4)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | (1) | (2) | 0 | (2)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Interest rate derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives |  | (2) | 1 | (2)
Significant Unobservable Inputs (Level 3) | Total Fixed Maturities, AFS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets |  |  |  | (1)
CMBS | Significant Unobservable Inputs (Level 3) | Total Fixed Maturities, AFS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ 0 | $ 0 | $ 0 | $ (1)

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=66048111&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 Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement for a financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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