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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Millions	Jun. 30, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Materials and supplies, allowance for obsolescence | $	$ 150	$ 153
Shares, authorized	417,060,033	417,060,033
Shares, conditionally authorized	143,783,041	143,783,041
Shares, issued	394,801,990	394,801,990
Shares, outstanding	391,181,430	389,366,241
Maximum
Allowance for doubtful accounts | $	$ 1	$ 1

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- Definition

Conditional capital represents the amount of additional registered shares that the board is authorized to issue without obtaining additional shareholder approval.

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- Definition

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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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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 shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of valuation reserve for inventory.

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