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Tax | 6 Months Ended
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Jun. 30, 2013
Income Tax Disclosure [Abstract] |
Tax | 8. Tax The effective tax rate for the three and six months ended June 30, 2013 was 31.0% and 31.0%, respectively, compared to 32.1% and 31.5% for the same period in 2012. Compared to the U.S. statutory rate, the effective tax rate was positively impacted in the periods by the effect of lower tax rates on income earned in foreign jurisdictions, and the deduction in the U.S. for manufacturing activities. The effective tax rate for 2013 was negatively impacted by foreign exchange gains for tax reporting in Norway, while 2012 was positively impacted by foreign exchange losses for tax reporting in Norway. 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 June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Federal income tax at U.S. federal statutory rate |  | $ | 270 |  |  | $ | 310 |  |  | $ | 523 |  |  | $ | 616 |
Foreign income tax rate differential |  |  | (65 | ) |  |  | (57 | ) |  |  | (122 | ) |  |  | (80 | )
State income tax, net of federal benefit |  |  | 4 |  |  |  | 9 |  |  |  | 12 |  |  |  | 17 |
Nondeductible expenses |  |  | 8 |  |  |  | 10 |  |  |  | 16 |  |  |  | 23 |
Tax benefit of manufacturing deduction |  |  | (8 | ) |  |  | (9 | ) |  |  | (16 | ) |  |  | (18 | )
Foreign dividends, net of foreign tax credits |  |  | 8 |  |  |  | 14 |  |  |  | 12 |  |  |  | 20 |
Tax impact of foreign exchange |  |  | 21 |  |  |  | 12 |  |  |  | 39 |  |  |  | (18 | )
Other |  |  | 1 |  |  |  | (4 | ) |  |  | (1 | ) |  |  | (6 | )
Provision for income taxes |  | $ | 239 |  |  | $ | 285 |  |  | $ | 463 |  |  | $ | 554 |
The balance of unrecognized tax benefits at June 30, 2013 was $128 million, $55 million of which if ultimately realized, would be recorded as income tax benefit. The Company recognized no material changes in the balance of unrecognized tax benefits for the three and six months ended June 30, 2013. The Company does not anticipate that its total unrecognized tax benefits will significantly change due to the settlement of audits or the expiration of statutes of limitation within 12 months of this reporting date. The Company is subject to taxation in the U.S., various states and foreign jurisdictions. The Company has significant operations in the United States, Canada, the United Kingdom, the Netherlands and Norway. Tax years that remain subject to examination by major tax jurisdiction vary by legal entity, but are generally open in the U.S. for tax years after 2007 and outside the U.S. for tax years after 2005. To the extent penalties and interest would be assessed on any underpayment of income tax, such accrued amounts have been classified as a component of income tax expense in the financial statements.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: 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=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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