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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 93	$ 124
Accumulated depreciation	$ 1,457	$ 1,544
Common stock par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1	1

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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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