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v3.19.3.a.u2

Fair Value Measurements - Significant Unobservable Inputs - Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Equity options |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ (15) | $ 3
Interest Rate Swaption |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative Assets (Liabilities), at Fair Value, Net |  | $ 1
Interest Rate Swaption | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve |  | 3.00%
Interest Rate Swaption | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve |  | 3.00%
Interest Rate Swaption | Weighted Average Expected Life |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve |  | 3.00%
Measurement Input, Option Volatility [Member] | Equity options | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 13.00% | 19.00%
Measurement Input, Option Volatility [Member] | Equity options | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 28.00% | 21.00%
Measurement Input, Option Volatility [Member] | Equity options | Weighted Average Expected Life |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Fair Value Measurements, Unobservable Swap_Curve | 17.00% | 20.00%

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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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Namespace Prefix: | hig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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=117331979&loc=d3e41228-113958 + Details
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Balance Type: | debit
Period Type: | instant

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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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