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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Millions	Mar. 31, 2020 USD ($) shares	Mar. 31, 2020 SFr / shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 SFr / shares
CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts | $	$ 2
Materials and supplies, allowance for obsolescence | $	$ 127		$ 127
Shares, CHF par value (in Swiss francs per share) | SFr / shares		SFr 0.10		SFr 0.10
Shares, authorized	639,674,422		639,674,422
Shares, conditionally authorized	142,365,398		142,365,398
Shares, issued	617,970,525		617,970,525
Shares, outstanding	614,545,303		611,871,374

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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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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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