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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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