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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for doubtful accounts | $ 114 | $ 112
Accumulated depreciation | $ 1,348 | $ 1,281
Common stock par value | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 1 | 1

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