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v3.10.0.1

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Aug. 22, 2018 | May 31, 2018 | Jan. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount |  |  |  |  |  | $ (5,000,000) | $ (15,000,000) | $ 0 |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  | $ (88,000,000) |  |  |  |  |
Equity securities, at fair value |  |  |  |  |  | 0 | 1,012,000,000 |  |
Fee income |  |  |  |  |  | 1,313,000,000 | 1,168,000,000 | 1,041,000,000 |
Other Income |  |  |  |  |  | 105,000,000 | 85,000,000 | 86,000,000 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  | 1,418,000,000 | 1,253,000,000 | 1,127,000,000 |
Cumulative Effect on Retained Earnings, before Tax |  |  |  |  |  | 1,000,000 |  |  |
Participating dividends to policyholders |  |  |  |  |  | 23,000,000 | 35,000,000 | 15,000,000 |
Accumulated depreciation |  |  |  |  |  | 1,600,000,000 | 2,600,000,000 |  |
Depreciation expense |  |  |  |  |  | 232,000,000 | 197,000,000 | 186,000,000 |
Incentive to Lessee | $ 10,000,000 |  |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  |  | $ 642,000,000 | 713,000,000 |  |
Minimum | Other Intangible Assets |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  |  | 1 year |  |  |
Maximum [Member] | Other Intangible Assets |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  |  | 15 years |  |  |
Property and Casualty Insurance Products |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net written premiums |  |  |  |  |  | $ 0.10 | 0.10 | 0.09 |
Allowance for Doubtful Accounts |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowances and reserves |  |  |  |  |  | 135,000,000 | 132,000,000 | 137,000,000 | $ 134,000,000
Scenario, Forecast |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 150,000,000 |  |  |  |  |  |  |  |
Operating Lease, Liability | $ 160 |  |  |  |  |  |  |  |
Operating Segments [Member] | Commercial Lines |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  |  | 0 | 0 |  |
Operating Segments [Member] | Commercial Lines | Installment billing fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 34,000,000 | 37,000,000 | 39,000,000 |
Operating Segments [Member] | Personal Lines Segment [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  |  | 0 | 0 |  |
Operating Segments [Member] | Personal Lines Segment [Member] | Installment billing fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 40,000,000 | 44,000,000 | 39,000,000 |
Operating Segments [Member] | Personal Lines Segment [Member] | Insurance servicing fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  | 84,000,000 | 85,000,000 | 86,000,000 |
Operating Segments [Member] | Group Benefits |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  |  | 427,000,000 | 441,000,000 |  |
Operating Segments [Member] | Group Benefits | Administrative services fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 175,000,000 | 91,000,000 | 75,000,000 |
Operating Segments [Member] | Hartford Funds |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  |  | 0 | 0 |  |
Operating Segments [Member] | Hartford Funds | Advisor, distribution and other management fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 947,000,000 | 897,000,000 | 797,000,000 |
Operating Segments [Member] | Hartford Funds | Other fees [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 85,000,000 | 95,000,000 | 88,000,000 |
Corporate |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 32,000,000 | 4,000,000 | 3,000,000 |
Other Income |  |  |  |  |  | 21,000,000 | 0 | 0 |
Reserve for future policy benefits |  |  |  |  |  | 215,000,000 | 272,000,000 |  |
Insurance Operating Costs |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Distribution costs |  |  |  |  |  |  | (188,000,000) | (184,000,000) |
Fee Income |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Distribution costs |  |  |  |  |  |  | 188,000,000 | 184,000,000 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  |  | $ (193,000,000) |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Other Income [Member] | Minimum |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal |  |  | 5 years |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Other Income [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal |  |  | 24 months |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 83,000,000 |  |  |  |  |
Equity securities, at fair value |  |  |  |  |  |  | 1,012,000,000 |  |
Shadow DAC [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  | 10,000,000 |  |  |  |  |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  | (105,000,000) |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Tax benefit on employee stock options and share-based awards |  |  |  |  |  | $ 0 | 0 | $ 5,000,000 |
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  |  |  |  | $ 273,000,000 |  |
Accumulated Net Unrealized Investment Gain (Loss) | Equity securities |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Equity securities, at fair value |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
The Navigators Group, Inc. [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  | $ 70 |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 2,100,000,000 |  |  |  |  |  |  |

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