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Employee Benefit Plans Level 4 Investment and Savings Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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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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