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Income Taxes Level 4 Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves | $ 508 | $ 524
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 144 | 162
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve | 390 | 377
Deferred Tax Assets, Investments | 593 | 831
Deferred Tax Assets, Derivative Instruments | 79 | 90
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | 517 | 655
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 640 | 639
Deferred Tax Assets, Tax Credit Carryforwards, General Business | 99 | 0
Deferred Tax Assets, Operating Loss Carryforwards | 1,894 | 1,831
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 56 | 154
Deferred Tax Assets, Capital Loss Carryforwards | 0 | 78
Deferred Tax Assets, Gross | 5,037 | 5,341
Deferred Tax Assets, Valuation Allowance | 0 | (79)
Deferred Tax Assets, Net of Valuation Allowance | 5,037 | 5,262
Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost | (676) | (943)
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net | (837) | (842)
Deferred Tax Liabilities, Deferred Expense | 243 | 229
Deferred Tax Liabilities, Other | 0 | (42)
Deferred Tax Liabilities, Gross | 1,756 | 2,056
Deferred Tax Assets, Net | $ 3,281 | 3,206
Valuation Allowance, Commentary | A deferred tax valuation allowance has not been recorded because the Company believes the deferred tax assets will more likely than not be realized. In assessing the need for a valuation allowance, management considered future taxable temporary difference reversals, future taxable income exclusive of reversing temporary differences and carryovers, taxable income in open carry back years and other tax planning strategies. From time to time, tax planning strategies could include holding a portion of debt securities with market value losses until recovery, altering the level of tax exempt securities held, making investments which have specific tax characteristics, and business considerations such as asset-liability matching. Management views such tax planning strategies as prudent and feasible and would implement them, if necessary, to realize the deferred tax assets. |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  | 1,814
Deferred Tax Assets, Tax Credit Carryforwards | $ 56 | 154
Tax Credit Carryforward, Amount | 0 | 222
Deferred Tax Assets, Other | 117 | 0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | 17
Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards | 1,894 |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 5,412 |
Operating Loss Carryforwards |  | 5,182
Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards | 9 |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 48 |
Operating Loss Carryforwards |  | $ 89
Expiring Tax Year 2020 [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 1 |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2020 |
Latest Tax Year [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2036 |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2036 |
Expiring within Tax Years 2023 to 2033 [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 5,411 |
No expiration tax year [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 640 |
Deferred Tax Assets, Operating Loss Carryforwards | 48 |
Expiring within Tax Years 2020 to 2024 [Member] [Member] [Domain] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 56 |
Expiring Tax Year 2019 [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Capital Loss Carryforwards | $ 0 |
Earliest Tax Year [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2020 |
Energy Solar [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business | $ 96 |

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