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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

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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

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

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hig_MutualFundsMember
Namespace Prefix:
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Balance Type:
Period Type: