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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The income tax provision consisted of the following:
| Three months ended June 30, |  | Six months ended June 30,
In millions, except rates | 2018 |  | 2017 |  | 2018 |  | 2017
Income/(Loss) before income taxes | $ | 129 |  |  | $ | 103 |  |  | $ | 361 |  |  | $ | (71 | )
Income tax expense/(benefit) from continuing operations | 8 |  |  | 4 |  |  | 7 |  |  | (1 | )
Effective tax rate | 6.2 | % |  | 3.9 | % |  | 1.9 | % |  | 1.4 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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