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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for receivables	$ 2	$ 1
Allowance for inventories	27	22
Accumulated amortization	$ 360	$ 319
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25.0	25.0
Preferred Stock, Shares Issued (in shares)	0.0	0.0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	900.0	900.0
Common stock shares issued (in shares)	474.0	427.0
Common stock, shares outstanding (in shares)	316.0	282.0
Treasury stock, shares (in shares)	158.0	145.0

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

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