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Level 4- Significant Unobservable Inputs Freestanding Derivatives (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Interest Rate Swaption | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 2 | $ 1
Interest Rate Swaption | Minimum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 3.00% | 2.00%
Interest Rate Swaption | Maximum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 3.00% | 2.00%
Equity options |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net |  | $ 1
Fair Value Measurements, Sensitivity Analysis, Description |  | Increase
Equity options | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 1 |
Equity options | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate |  | 18.00%
Equity options | Minimum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 20.00% |
Equity options | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate |  | 22.00%
Equity options | Maximum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 27.00% |

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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://www.xbrl.org/2003/role/presentationRef -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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Description of the sensitivity of the fair value measurements to changes in unobservable inputs and the inter-relationships between those inputs as well as how those inter-relationships might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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