| **Earnings Per Share - (Tables)**                                             | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Earnings Per Share [Abstract]**                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Number of shares used for calculation of basic and diluted earnings per share | A reconciliation of the number of shares used for the basic and diluted earnings per share (“EPS”) computations is as follows for the years ended December 31: 2014 2013 2012Weighted average common shares outstanding for basic EPS437 443 440Effect of dilutive securities - stock plans2 1 1Adjusted weighted average common shares outstanding for diluted EPS439 444 441Future potentially dilutive shares excluded from diluted EPS:     Options with an exercise price greater than the average market price for the period2 4 7 |

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| - Definition
Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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