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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 135	$ 132
Accumulated depreciation	(6,497)	(6,444)
Accumulated amortization	$ 618	$ 593
Common stock, par value (USD per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	112,000,000	112,000,000
Common stock, shares outstanding (in shares)	62,000,000	63,000,000
Treasury stock (in shares)	50,000,000	49,000,000

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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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