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Stock Compensation Plans Level 4 Subsidiary Stock Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Subsidiary Stock | $ 7 | $ 7 | $ 4
subsidiary stock repurchase [Member] | Mutual Funds [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Subsidiary Stock | $ 2 |  |

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- Definition Subsidiary Stock + References No definition available. + Details
Name: | hig_SubsidiaryStock
Namespace Prefix: | hig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=hig_SubsidiarystockrepurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hig_MutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |