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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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