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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense (Benefit) and Effective Tax Rate | The Company’s income tax expense and effective tax rate for the three and nine months ended September 30, 2018 and 2017 were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (dollars in millions)
Income tax expense | $ | 66 |  |  | $ | 31 |  |  | $ | 208 |  |  | $ | 88 |
Effective tax rate | 23 | % |  | 9 | % |  | 20 | % |  | 10 | %

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