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Business Acquisitions, Dispositioins and Discontinued Operations Level 4 (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 30, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 29, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Separate Accounts, Liability |  | $ 115,665 |  |  |  | $ 120,123 |  |  |  | $ 115,665 | $ 120,123 |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  |  | (650) |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 0 | $ 0 | $ 0 | $ 0 | 0 | $ 9 | $ 0 | $ 0 | 0 | 9 | $ (551) |
Other Liabilities |  | 6,992 |  |  |  | 6,597 |  |  |  | 6,992 | 6,597 |  |
Short-term Debt |  | 416 |  |  |  | 275 |  |  |  | 416 | 275 |  |
Other Policyholder Funds |  | 31,176 |  |  |  | 31,670 |  |  |  | 31,176 | 31,670 |  |
Other Assets |  | 1,786 |  |  |  | 1,639 |  |  |  | 1,786 | 1,639 |  |
Property, Plant and Equipment, Net |  | 991 |  |  |  | 974 |  |  |  | 991 | 974 |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 23,311 |  |  |  | 23,189 |  |  |  | 23,311 | 23,189 |  |
Liabilities |  | 206,529 |  |  |  | 210,706 |  |  |  | 206,529 | 210,706 |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (92) | 305 | 350 |
Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  |  | 13,811 | 13,577 | 13,336 |
Disposal Group, Including Discontinued Operation, Net Investment Income, Securities Available-for-sale and Other |  |  |  |  |  |  |  |  |  | 2,961 | 3,030 | 3,154 |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  |  | 268 | 156 | (16) |
Benefits, losses and expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation Benefits, Losses and Loss Adjustment Expenses, Returns Credited on International Variable Annuities |  |  |  |  |  |  |  |  |  | 11,351 | 10,775 | 10,805 |
Deferred Policy Acquisition Costs and Present Value of Future Profits, Amortization |  |  |  |  |  |  |  |  |  | 1,523 | 1,502 | 1,729 |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  | 1,097 |  |  |  | 1,121 |  |  |  | 1,097 | 1,121 |  |
Available-for-sale Securities, Debt Securities |  | 56,003 |  |  |  | 59,196 |  |  |  | 56,003 | 59,196 |  |
Mortgage Loans on Real Estate, Commercial and Consumer, Net |  | 5,697 |  |  |  | 5,624 |  |  |  | 5,697 | 5,624 |  |
Loans, Gross, Insurance Policy |  | 1,444 |  |  |  | 1,447 |  |  |  | 1,444 | 1,447 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  | 71 |
Net realized capital gain (loss) on disposal, net of tax |  |  |  |  |  |  |  |  |  | (81) | 6 | (653) |
Goodwill |  | 567 |  |  |  | 498 |  |  |  | 567 | 498 |  |
HFPI estimated tax benefit on disposition |  | 0 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current |  | 870 |  |  |  | 0 |  |  |  | 870 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current |  | 611 |  |  |  | 0 |  |  |  | 611 | 0 |  |
P&C Runoff Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  | 657 |  |  |  |  |  |  |  | 657 |  |  |
Disposal Group, Including Discontinued Operation, Other Liabilities |  | 11 |  |  |  |  |  |  |  | 11 |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | 259 |  |  |  |  |  |  |  | 259 |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  | 81 |  |  |
HFPI estimated tax benefit on disposition |  |  |  |  |  |  |  |  |  | 76 |  |  |
HFPI estimated after tax gain |  |  |  |  |  |  |  |  |  | 5 |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  | 213 |  |  |  |  |  |  |  | 213 |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current |  | 870 |  |  |  |  |  |  |  | 870 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 600 |  |  |  |  |  |  |  | 600 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current |  | 611 |  |  |  |  |  |  |  | 611 |  |  |
Hartford Life International Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized capital gain (loss) on disposal, net of tax |  |  |  |  |  |  |  |  |  |  |  | (622) |
Retirement Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 8,600 |  |  |  | 8,600 |  |  |  | 8,600 | 8,600 |  |
Hartford Life Insurance K.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation |  |  |  |  |  |  |  |  |  |  |  | 265 |
Individual Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 11,100 |  |  |  | 10,800 |  |  |  | 11,100 | 10,800 |  |
Hartford Life Insurance K.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |  |  |  |  |  | 102 |
Short-term Debt |  |  |  |  |  |  |  |  |  |  |  | 247 |
Other Policyholder Funds |  |  |  |  |  |  |  |  |  |  |  | 2,265 |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense |  |  |  |  |  |  |  |  |  |  |  | 320 |
Other Assets |  |  |  |  |  |  |  |  |  |  |  | 988 |
Property, Plant and Equipment, Net |  |  |  |  |  |  |  |  |  |  |  | 18 |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  |  |  |  |  |  |  |  |  |  |  | 46 |
Investments and Cash |  |  |  |  |  |  |  |  |  |  |  | 18,733 |
Hartford Life Insurance K.K. [Member] | International Annuity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Policyholder Funds |  |  |  |  |  |  |  |  |  |  |  | 16,465 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  | 177 |  |  |  | 154 |  |  |  | 177 | 154 |  |
Available-for-sale Securities, Debt Securities |  | 51,573 |  |  |  | 55,143 |  |  |  | 51,573 | 55,143 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  | 99 |  |  |  | 93 |  |  |  | 99 | 93 |  |
Available-for-sale Securities, Debt Securities |  | 3,810 |  |  |  | 3,313 |  |  |  | 3,810 | 3,313 |  |
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Investment Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 526 |  |  |  | 682 |  |  |  | 526 | 682 |  |
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] | Investment Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  | 487 |  |  |  | $ 619 |  |  |  | $ 487 | $ 619 |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  |  |  |  | (1) |
Fee income and other |  |  |  |  |  |  |  |  |  |  |  | 239 |
Disposal Group, Including Discontinued Operation, Net Investment Income, Securities Available-for-sale and Other |  |  |  |  |  |  |  |  |  |  |  | 152 |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  |  |  |  | 157 |
Total revenues |  |  |  |  |  |  |  |  |  |  |  | 233 |
Benefits, losses and expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation Benefits, Losses and Loss Adjustment Expenses, Returns Credited on International Variable Annuities |  |  |  |  |  |  |  |  |  |  |  | 7 |
Deferred Policy Acquisition Costs and Present Value of Future Profits, Amortization |  |  |  |  |  |  |  |  |  |  |  | 0 |
Insurance operating costs and other expenses |  |  |  |  |  |  |  |  |  |  |  | 23 |
Total benefits, losses and expenses |  |  |  |  |  |  |  |  |  |  |  | 164 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  | 69 |
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | (2) |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  | (551) |
Discontinued Operations, Disposed of by Sale [Member] | International Annuity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits, losses and expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation Benefits, Losses and Loss Adjustment Expenses, Returns Credited on International Variable Annuities |  |  |  |  |  |  |  |  |  |  |  | 134 |
Discontinued Operations, Disposed of by Sale [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Net Investment Income, Securities Available-for-sale and Other |  |  |  |  |  |  |  |  |  |  |  | 18 |
Discontinued Operations, Disposed of by Sale [Member] | Equity Securities [Member] | Trading Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Net Investment Income, Securities Available-for-sale and Other |  |  |  |  |  |  |  |  |  |  |  | 134 |
Discontinued Operations, Disposed of by Sale [Member] | Hartford Life Insurance K.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  |  |  |  | 963 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized capital gain (loss) on disposal, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 659 |
Maxum [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jul. 29, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Maxum Specialty Insurance Group |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 169 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  |  |  |  |  |  |  |  | $ 274
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  |  |  |  |  |  |  | 113
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 11
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  |  |  |  |  |  |  |  |  |  |  | 79
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  | 477
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  |  |  |  |  | 235
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 77
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  |  |  |  |  |  |  |  |  |  |  |  | 34
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 346
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  | 131
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 38
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  | 169
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 6
Business Combination, Goodwill Recognized, Description |  |  |  |  |  |  |  |  |  | The goodwill recognized is attributable to expected growth from the opportunity to sell both existing products and excess and surplus lines coverage to a broader customer base and has been allocated to the Small Commercial reporting unit within the Commercial Lines reporting segment. |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 1 |  |  |
Business Acquisition, Pro Forma Information, Description | Maxum's revenues and earnings since the acquisition date are included in the Company's Consolidated Statements of Operations and are not material to the Company's consolidated results of operations. |  |  |  |  |  |  |  |  |  |  |  |
Lattice [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jul. 29, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Lattice Strategies LLC |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 19 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  | 23
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 1
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 11
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  | 12
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  | 11
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 31
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  | 42
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 1
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 60 |  |  |  |  |  |  |  | $ 60 |  |  |
Business Combination, Contingent Consideration Arrangements, Basis for Amount |  |  |  |  |  |  |  |  |  | The contingent consideration was measured at fair value at the acquisition date by projecting future ETP AUM and discounting expected payments back to the valuation date. The projected ETP AUM and risk-adjusted discount rate are significant unobservable inputs to fair value. |  |  |
Business Combination, Goodwill Recognized, Description |  |  |  |  |  |  |  |  |  | The goodwill recognized is attributable to the fact that the acquisition of Lattice enables the Company to offer ETPs which are expected to be a significant source of future revenue and earnings growth. Goodwill is allocated to the Mutual Funds reporting segment. |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 1 |  |  |
Assets under Management, Carrying Amount |  |  |  |  |  |  |  |  |  |  |  |  | 200
Business Acquisition, Pro Forma Information, Description | Lattice's revenues and earnings since the acquisition date are included in the Company's Consolidated Statements of Operations in the Mutual Funds reporting segment and are not material to the Company's consolidated results of operations. |  |  |  |  |  |  |  |  |  |  |  |
Not Amortized [Member] | Maxum [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  | 5
Not Amortized [Member] | Lattice [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 10
Accounts Receivable [Member] | P&C Runoff Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  | $ 71 |  |  |  |  |  |  |  | $ 71 |  |  |

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