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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of Operating Loss Carryforwards [Table Text Block] |
Components of the net operating loss carryforwards as of December 31, 2018
($ in millions) |  | 20-Year Carryforward Expires in 2025-2036 |  | Indefinite Carryforward Period |  | Total
US Federal |  | $ | 149 |  |  | $ | 60 |  |  | $ | 209 |
Foreign |  | — |  |  | 30 |  |  | 30 |
Total |  | $ | 149 |  |  | $ | 90 |  |  | $ | 239 |
Reconciliation of the change in the amount of unrecognized tax benefits |
Reconciliation of the change in the amount of unrecognized tax benefits
|  | For the years ended December 31,
($ in millions) |  | 2018 |  | 2017 |  | 2016
Balance – beginning of year |  | $ | 55 |  |  | $ | 10 |  |  | $ | 7 |
Increase for tax positions taken in a prior year |  | 3 |  |  | 34 |  |  | — |
Increase for tax positions taken in the current year |  | 12 |  |  | 11 |  |  | 3 |
Balance – end of year |  | $ | 70 |  |  | $ | 55 |  |  | $ | 10 |
Components of the deferred income tax assets and liabilities |
Components of the deferred income tax assets and liabilities
|  | As of December 31,
($ in millions) |  | 2018 |  | 2017
Deferred tax assets |  |  |  |
Unearned premium reserves |  | $ | 594 |  |  | $ | 545 |
Accrued compensation |  | 145 |  |  | 137 |
Pension |  | 192 |  |  | 86 |
Discount on loss reserves |  | 67 |  |  | 53 |
Net operating loss carryover |  | 50 |  |  | 50 |
Other assets |  | 57 |  |  | 49 |
Other postretirement benefits |  | 45 |  |  | 48 |
Total deferred tax assets |  | 1,150 |  |  | 968 |
Deferred tax liabilities |  |  |  |
DAC |  | (854 | ) |  | (770 | )
Unrealized net capital gains |  | (2 | ) |  | (422 | )
Life and annuity reserves |  | (194 | ) |  | (241 | )
Intangible assets |  | (145 | ) |  | (113 | )
Investments |  | (278 | ) |  | (106 | )
Other liabilities |  | (102 | ) |  | (98 | )
Total deferred tax liabilities |  | (1,575 | ) |  | (1,750 | )
Net deferred tax liability |  | $ | (425 | ) |  | $ | (782 | )
Components of income tax expense |
Components of income tax expense
|  | For the years ended December 31,
($ in millions) |  | 2018 |  | 2017 |  | 2016
Current |  | $ | 704 |  |  | $ | 1,018 |  |  | $ | 654 |
Deferred |  | (236 | ) |  | (23 | ) |  | 188 |
Total income tax expense |  | $ | 468 |  |  | $ | 995 |  |  | $ | 842 |
Reconciliation of the statutory federal income tax rate to the effective income tax rate on income from operations |
Reconciliation of the statutory federal income tax rate to the effective income tax rate
|  | For the years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Statutory federal income tax rate on income from operations |  | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Tax Legislation benefit |  | (1.1 | ) |  | (11.2 | ) |  | — |
Share-based payments |  | (0.6 | ) |  | (1.4 | ) |  | — |
Tax-exempt income |  | (0.9 | ) |  | (0.7 | ) |  | (1.2 | )
Tax credits |  | (1.3 | ) |  | (1.3 | ) |  | (1.3 | )
Non-deductible goodwill impairment |  | — |  |  | 1.0 |  |  | — |
Other |  | 0.7 |  |  | 0.5 |  |  | (0.7 | )
Effective income tax rate on income from operations |  | 17.8 | % |  | 21.9 | % |  | 31.8 | %

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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