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Income Tax (Tables) | 3 Months Ended
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Mar. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The provision for income tax differed from the amounts computed by applying the U.S. federal income tax statutory rate of 21% to pre-tax income as a result of the following for the three months ended March 31, 2020 and 2019, respectively (dollars in millions):
|  | Three months ended March 31,
|  | 2020 |  | 2019
Tax provision at U.S. statutory rate |  | $ | (20 | ) |  | $ | 45 |
Increase (decrease) in income taxes resulting from: |  |  |  |
Tax rate differences on income in other jurisdictions |  | 4 |  |  | 1 |
Differences in tax bases in foreign jurisdictions |  | 3 |  |  | (15 | )
Deferred tax valuation allowance |  | (4 | ) |  | 19 |
Amounts related to uncertain tax positions |  | 6 |  |  | 1 |
Corporate rate changes |  | — |  |  | (2 | )
Equity compensation excess benefit |  | (1 | ) |  | (2 | )
Non-Deductible Expenses |  | 4 |  |  | — |
Total provision for income taxes |  | $ | (8 | ) |  | $ | 47 |
Effective tax rate |  | 8.9 | % |  | 21.7 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -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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