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Employee Benefit Plans Level 4 Investment and Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan Non Elective Contribution Percent	2.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	6.00%
Earning of Employees Below and Above Limit	$ 1
Cost to Company Related to Investment and Saving Plan	115	$ 117	$ 113
Assets	223,432	$ 228,348
Separate Accounts [Member] | Hartford Life Insurance Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets	$ 438

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Cost to company related to Investment and Saving Plan.

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Defined contribution plan non elective contribution percent.

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Earning of employees below and above limit.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Percentage employer matches of the employee's percentage contribution matched.

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