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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 2 $ 2
Inventory valuation reserves 22 27
Accumulated amortization $ 379 $ 360
Preferred stock, par value (In dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 25 25
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 900 900
Common stock, shares issued (in shares) 476 474
Common stock, shares, outstanding (in shares) 318 316
Treasury stock, shares (in shares) 158 158