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Consolidated Balance Sheet (Parenthetical) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Consolidated Balance Sheet [Abstract]
Allowance for accounts and notes receivable	$ 11,000,000	$ 4,000,000
Accumulated depreciation, depletion and amortization	$ 66,664,000,000	$ 64,748,000,000
Common stock, shares authorized	2,500,000,000	2,500,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	1,790,924,215	1,785,419,175
Treasury stock, shares	639,682,327	608,312,034

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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