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Segment Information Level 4 (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 6 |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | $ 1,502 | $ 1,571 | $ 1,593
Earned premiums and fee income |  |  |  |  |  |  |  |  | 15,521 | 15,416 | 15,332
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Insurance Commissions and Fees |  |  |  |  |  |  |  |  | 1,710 | 1,839 | 1,996
Total net investment income |  |  |  |  |  |  |  |  | 2,961 | 3,030 | 3,154
Net realized capital losses |  |  |  |  |  |  |  |  | (268) | (156) | 16
Other revenues |  |  |  |  |  |  |  |  | 86 | 87 | 112
Segments, Geographical Areas [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,537 | $ 4,695 | $ 4,677 | $ 4,391 | $ 4,513 | $ 4,562 | $ 4,685 | $ 4,617 | 18,300 | 18,377 | 18,614
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (81) | $ 438 | $ 216 | $ 323 | 421 | $ 381 | $ 413 | $ 467 | 896 | 1,682 | 798
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (92) | 305 | 350
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 223,432 |  |  |  | 228,348 |  |  |  | 223,432 | 228,348 |
Amortization of deferred policy acquisition costs and present value of future profits |  |  |  |  |  |  |  |  | (1,523) | (1,502) | (1,729)
Available-for-sale Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total net investment income |  |  |  |  |  |  |  |  | 2,961 | 3,030 | 3,153
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total net investment income |  |  |  |  |  |  |  |  | 0 | 0 | 1
Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | 973 | 951 | 919
Earned premiums and fee income |  |  |  |  |  |  |  |  | 6,651 | 6,511 | 6,289
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 1,007 | 1,003 | 983
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 422 | 409 | 385
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 29,141 |  |  |  | 28,388 |  |  |  | 29,141 | 28,388 |
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | 348 | 359 | 348
Earned premiums and fee income |  |  |  |  |  |  |  |  | 3,898 | 3,873 | 3,806
Segment Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
AARP earned premiums |  |  |  |  |  |  |  |  | 3,300 | 3,200 | 3,000
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (22) | 187 | 207
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (30) | 82 | 92
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 6,083 |  |  |  | 6,147 |  |  |  | 6,083 | 6,147 |
Other Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 0 | 32 | 1
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (529) | (53) | (108)
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (355) | (47) | (51)
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 4,732 |  |  |  | 4,562 |  |  |  | 4,732 | 4,562 |
Group Insurance Policies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | 31 | 31 | 32
Earned premiums and fee income |  |  |  |  |  |  |  |  | 3,223 | 3,136 | 3,095
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 230 | 187 | 191
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 83 | 63 | 63
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 9,405 |  |  |  | 9,666 |  |  |  | 9,405 | 9,666 |
Mutual Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | 24 | 22 | 28
Earned premiums and fee income |  |  |  |  |  |  |  |  | 701 | 723 | 723
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 78 | 86 | 87
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 43 | 48 | 49
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 480 |  |  |  | 449 |  |  |  | 480 | 449 |
Talcott Resolution [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 1,044 | 1,133 | 1,407
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 244 | 430 | (187)
Talcott Resolution [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  | 147 | 139 | 402
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 54 | (17) | 16
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | 170,327 |  |  |  | 175,319 |  |  |  | 170,327 | 175,319 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Insurance Commissions and Fees |  |  |  |  |  |  |  |  | 4 | 8 | 11
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (112) | (158) | (375)
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (309) | (233) | (204)
Assets by Segment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Assets | $ 3,264 |  |  |  | $ 3,817 |  |  |  | 3,264 | 3,817 |
Fixed Equity and other mutual fund investments [Member] | Mutual Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 601 | 607 | 586
Homeowners [Member] | Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 1,178 | 1,202 | 1,193
Disability Insurance Policy [Member] | Group Insurance Policies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 1,506 | 1,479 | 1,450
Automobiles Consumer [Member] | Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 2,720 | 2,671 | 2,613
Surety Product Line [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 218 | 218 | 210
Package Business [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 1,229 | 1,203 | 1,163
Automobiles Commercial [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 640 | 614 | 591
Accident and Health Insurance Product Line [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 3,174 | 3,051 | 2,971
General Liability [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 585 | 567 | 582
Property Insurance Product Line [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 575 | 637 | 559
Other Insurance Product Line [Member] | Group Insurance Policies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 205 | 180 | 167
Life Insurance Product Line [Member] | Group Insurance Policies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 1,512 | 1,477 | 1,478
Investments Product Line [Member] | Mutual Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | 100 | 116 | 137
Professional Liability [Member] | Property & Casualty Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned premiums and fee income |  |  |  |  |  |  |  |  | $ 230 | $ 221 | $ 213

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