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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Consolidated Balance Sheet |  |
Allowances for doubtful accounts receivable | $ 95 | $ 103
Common stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01
Common stock, Shares outstanding (in shares) | 576,575,168 | 594,884,237

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