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Statements Of Condensed Consolidated Financial Position (Parenthetical) - $ / shares | Sep. 30, 2018 | Dec. 31, 2017
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Class of Stock [Line Items] |  |
Preferred stock, par value | $ 0 | $ 0
Common Stock, Par or Stated Value Per Share | $ 0.125 | $ 0.125
Common shares, authorized (in shares) | 600,000,000 | 600,000,000
Common shares, issued (in shares) | 301,886,794 | 301,886,794
Common shares, outstanding | 298,007,453 | 297,400,968
Common shares in treasury | 3,879,341 | 4,485,826
Preferred Class A [Member] |  |
Class of Stock [Line Items] |  |
Preferred stock, shares authorized (in shares) | 3,000,000 | 3,000,000
Preferred Class B [Member] |  |
Class of Stock [Line Items] |  |
Preferred stock, shares authorized (in shares) | 4,000,000 | 4,000,000

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