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Tax (Tables) | 9 Months Ended
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Sep. 30, 2016
Income Tax Disclosure [Abstract] |
Difference Between Effective Tax Rate | The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate of 35% was as follows (in millions):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Federal income tax at U.S. federal statutory rate |  | $ | (436 | ) |  | $ | 67 |  |  | $ | (637 | ) |  | $ | 380 |
Foreign income tax rate differential |  |  | 38 |  |  |  | (30 | ) |  |  | 14 |  |  |  | (117 | )
Nondeductible expenses |  |  | 2 |  |  |  | — |  |  |  | 23 |  |  |  | 17 |
Foreign dividends, net of foreign tax credits |  |  | (28 | ) |  |  | (1 | ) |  |  | (47 | ) |  |  | 14 |
Tax impact of foreign exchange |  |  | 9 |  |  |  | (4 | ) |  |  | 2 |  |  |  | (22 | )
Change in valuation allowance |  |  | 238 |  |  |  | — |  |  |  | 259 |  |  |  | — |
Goodwill impairment |  |  | 273 |  |  |  | — |  |  |  | 273 |  |  |  | — |
Tax rate change on temporary differences |  |  | (2 | ) |  |  | 1 |  |  |  | (5 | ) |  |  | (2 | )
Change in tax reserves |  |  | 39 |  |  |  | (2 | ) |  |  | 19 |  |  |  | 67 |
Other |  |  | (13 | ) |  |  | 5 |  |  |  | (20 | ) |  |  | (7 | )
Provision for income taxes |  | $ | 120 |  |  | $ | 36 |  |  | $ | (119 | ) |  | $ | 330 |

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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=65882285&loc=d3e32687-109319 + Details
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