| **Income Taxes Unaudited**                   | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Notes To Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Income Taxes                                 | 10.Income Taxes The provision for income taxes for the three months and nine months ended September 30, 2011 reflects an estimated annual effective tax rate of 25 percent compared to 24 percent for the first nine months of 2010 and 19 percent for the full year of 2010. The increase from the full-year 2010 effective tax rate is primarily due to expected changes in the geographic mix of pre-tax profits and the absence of $22 million of benefits included in the 2010 full-year effective tax rate related to prior years. The 2011 estimated annual effective tax rate is expected to be less than the U.S. corporate tax rate of 35 percent primarily due to profits in tax jurisdictions with lower tax rates. |

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| - Definition
Description containing the entire income tax disclosure. Examples 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. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49
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