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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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