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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, 2017 | Dec. 31, 2016
Interest Rate Swaption | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 1 | $ 9
Interest Rate Swaption | Minimum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Interest rate volatility | 2.00% | 2.00%
Interest Rate Swaption | Maximum | Long |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Interest rate volatility | 2.00% | 2.00%
Equity options |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 1 |
Equity options | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Interest rate volatility | 18.00% |
Equity options | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Interest rate volatility | 22.00% |

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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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