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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data	Jun. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets (Parenthetical)
Common stock, par or stated value per share	$ 1	$ 1
Common stock, shares authorized	1,350,000,000	1,350,000,000
Common stock, shares outstanding, net of treasury shares	347,773,580	357,362,604
Properties, accumulated depreciation	$ 9,217	$ 9,262

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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- Definition

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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