v3.8.0.1

Income Taxes Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2017
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | The table below shows our consolidated income tax expense (benefit) and our effective tax rates for the periods indicated (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Income tax expense (benefit) | $ | (2 | ) |  | $ | (4 | ) |  | $ | — |  |  | $ | 17 |
Effective tax rate | (1 | )% |  | (1 | )% |  | — | % |  | 20 | %

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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://www.xbrl.org/2003/role/presentationRef -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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