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CONSOLIDATED BALANCE SHEET (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Common stock, authorized (in shares) 960,000,000 960,000,000
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, issued (in shares) 477,828,813 476,881,991
Treasury stock (in shares) 78,957,318 78,957,318