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Consolidated Balance Sheet Parenthetical - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for doubtful accounts | $ 13 | $ 20
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 400,000,000 | 400,000,000
Common stock, shares outstanding | 140,227,692 | 146,746,537
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 50,000,000 | 50,000,000
Preferred stock, shares outstanding | 0 | 0

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