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Fair Value Measurements - Significant Unobservable Inputs Freestanding Derivatives (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ (6) | $ (4)
Interest Rate Swaption | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value | $ 1 | $ 1
Interest Rate Swaption | Minimum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 3.00% | 2.00%
Interest Rate Swaption | Maximum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 3.00% | 2.00%
Interest Rate Swaption | Weighted Average Expected Life | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 3.00% | 2.00%
Equity options |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value | $ 3 | $ 1
Equity options | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 19.00% | 18.00%
Equity options | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 21.00% | 22.00%
Equity options | Weighted Average Expected Life |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 20.00% | 20.00%
Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ (6) | $ (4)

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- Definition Range of input to the valuation of interest rate swaps that are unobservable due to the swap duration being in excess of the observable swap yield curve. + References No definition available. + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&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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